[i] The Bible says God will bless those who keep His Law/commandments with a good and long life on earth - DEUTERONOMY.28, PROVERBS.1, ROMANS.2:1-12.

But others will point to ‘If you want to enter into life, keep the commandments’  (Matt. 19:17).

Now behold, one came and said to Him, “Good Teacher, what good thing shall I do that I may have eternal life?” So He said to him, “Why do you call Me good?  No one is  good but One, that is, God. But if you want to enter into life, keep the commandments.” He said to Him, “Which ones?” Jesus said, “ ‘You shall not murder,’ ‘You shall not commit adultery,’ ‘You shall not steal,’ ‘You shall not bear false witness,’  ‘Honor your father and  your  mother,’ and, ‘You shall love your neighbor as yourself.’  ” The young man said to Him, “All these things I have kept from my youth. What do I still lack?” Jesus said to him, “If you want to be perfect, go, sell what you have and give to the poor, and you will have treasure in heaven; and come, follow Me.” But when the young man heard that saying, he went away sorrowful, for he had great possessions. Then Jesus said to His disciples, “Assuredly, I say to you that it is hard for a rich man to enter the kingdom of heaven.  And again I say to you, it is easier for a camel to go through the eye of a needle than for a rich man to enter the kingdom of God.” When His disciples heard it, they were greatly astonished, saying, “Who then can be saved?” But Jesus looked at them and said to them, “With men this is impossible, but with God all things are possible.”
Matthew 19:16‭-‬30 NKJV
https://bible.com/bible/114/mat.19.16-30.NKJV

Nothing to disagree with you here.

The word 'am' in john 8:58 is derived from greek text 'eimi' which can be translated to other word such as 'was", 'have'

But the point is the original text is not even the same, hence why 2 different phrase can be translated to one ' i am'.

I suggest u just to search the original text and u will find the last phrase not even the same and translated into one 'i am'.

Usually certain words need to be read and translated carefully when reading bible, such as 'son of god' or 'god'
Here in john 20:28 john expressed/saying my lord and my god, does not necessarily means jesus is god.
To me this verse contradicting another verses in the bible, some even come out from jesus himself.

I am the bread of life (chapter 6)
I am the light of the world (chap 8)
I am the door (chap 10)
I am the good shepherd (chap 10)
I am the ressurection and the life (chap 11)
I am the way, the truth and life (chap 14)
I am the vine (chap 15)

In my previous post i mentioned about the jews earlier question, they hardly accept when jesus compare himself to great prophet abraham as a prophet and how they react to it by try to stone jesus.

They are following Deuteronomy 18:20 that false prophets must be killed.

Or perhaps u can find a verse where the jews must kill false god in the bible?

Your father Abraham rejoiced to see My day, and he saw it and was glad.” Then the Jews said to Him, “You are not yet fifty years old, and have You seen Abraham?” Jesus said to them, “Most assuredly, I say to you, before Abraham was, I AM.”
John 8:56‭-‬58 NKJV
https://bible.com/bible/114/jhn.8.56-58.NKJV

The 50 years old part is connected with the rebirth if I'm not mistaken.
I do believe before born into this world, all prophets already existed and appointed  in plain of God's knowledge. Besides jeremiah 1:5, i do remember there is another verse mentioning about this but forgot the place.

If we read john 8 from first verse, the issue is about the prophecy of jesus, no issue of godhood was discussed.

Blessed be the God and Father of our Lord Jesus Christ, who has blessed us with every spiritual blessing in the heavenly places in Christ, just as He chose us in Him before the foundation of the world, that we should be holy and without blame before Him in love,
Ephesians 1:3‭-‬4 NKJV
https://bible.com/bible/114/eph.1.3-4.NKJV

For whom He foreknew, He also predestined to  be conformed to the image of His Son, that He might be the firstborn among many brethren. Moreover whom He predestined, these He also called; whom He called, these He also justified; and whom He justified, these He also glorified.
Romans 8:29‭-‬30 NKJV
https://bible.com/bible/114/rom.8.29-30.NKJV

In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God.
John 1:1‭-‬2 NKJV
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And the Word became flesh and dwelt among us, and we beheld His glory, the glory as of the only begotten of the Father, full of grace and truth.
John 1:14 NKJV
https://bible.com/bible/114/jhn.1.14.NKJV
https://bible.com/bible/114/jhn.1.1-2.NKJV

So meaning in the beginning only have 2 gods?

There are verses that crystal clear, and also verses which another verses can contadict it. I will stick with the clear ones.

If 'the lord' here refer to jesus, then jesus himslef said this in luke 18:19
“Why do you call Me good?” Jesus replied. “No one is good except God alone

One thing i cant understand is, do the christian follower read the bible before believing, or speak or giving statement?cz mostly the bible itself that contradict their understanding.

Bro, the trinity/triune is already an extrabiblical concept/doctrine as u can found in christian history

Why do you call Me good?” Jesus replied. “No one is good except God alone

Neither "faith alone" nor "grace alone" nor "works alone" are correct when it’s used to say that you don’t need to in any way to cooperate with God’s grace, that a merely intellectual faith would save you, nor accepting the initial grace given but not persevering, nor relying on works alone without faith. All three by themselves without the others are false.

"Faith alone" - dead
"Grace alone" - without cooperating on our part make us like robots.
"Works alone" - reminiscent of Pelagianism, relying purely on human nature for salvation.

Why are some Christians committing willful or intentional or voluntary sins/law-breaking and publicly confessing that nobody can actually keep the Law, including Christians like 'unknown warrior'.?

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Stay safe everyone! & also thomasthai down under! 

That means jesus is not god as he is not immortal.

What you term as salvific faith, we Catholics call it justification,. Why the difference I have no idea though, perhaps extreme antinomianism in play. Penance etc after repentance is actually Biblical, in fact penance and repentance are quite synonymous in the Bible:

Of course I realize some of you here thinks that penance is a dirty word in Christianity, something peculiar only to Catholics, and all that is needed was a genuine sense of sorrow for sin. Some even say that sorrow for sin was not needed. They claimed that repentance merely meant that you intellectually changed the way you thought from that moment forwards without any reference to past actions. I won't get into that debate here as I realize there are a multitude of denominations here having different ideas/teachings about that.

Early jesus followers dont even have trinity concept.
U must have study the christian history and be able to point out when this trinity became the foundation in christian.

U can point out what everyone said about jesus, but, what is the concept of god taught by jesus?

Actually Jesus did say many time He was God, just not in English. 

29 My Father, which gave them me, is greater than all; and no man is able to pluck them out of my Father's hand.
30 I and my Father are one.
31 Then the Jews took up stones again to stone him.
32 Jesus answered them, Many good works have I shewed you from my Father; for which of those works do ye stone me?
33 The Jews answered him, saying, For a good work we stone thee not; but for blasphemy; and because that thou, being a man, makest thyself God.

I think, while the Muslims are indoctrinated to think as such, the same can be said for Christians who do not bother to research and depend solely on their pastors for bible teachings.

Most of us read it in English. Unfortunately, the orginal texts are most Hebrew and with Jewish worldview contexts and tons of Jewish idioms, which we when reading in English with a Greco Roman worldview gets the context all wrong!

The cheek is that some translators put in English words in the original textual sentences to make it look right! 
Then, the syntax of the sentences just loses it all.