Have you ever come across what fallen world means?

A lot of people blame God for allowing evil in this world but they forgotten this world is a fallen world where the devil roams.

God has said it, this world will be destroyed one day and a new Heaven and a New Earth will come in to replace it where God himself is the ruler.

Until then evil will always happen until judgement day come where evil will end.

With that being said, does it mean God does not protect his own? Question to ask is that have those people claim a prayer protection over their children? Have they been close to God or just Christian by name? Have they been authentic and honest to God or have they just been playing religion?

We don't really know. There are many things we don't know but God knows.

Despite of that being said, there are people who have been raped and God raise that person to help others today. One such person is Joyce Meyer. She was rape by her dad at young age and yet God restored to her so many things, she's used by God mightily to teach and help others today. Sure she was scarred but you can hear her own testimony how she have been alleviated from her past.

Erm, I don't think anyone should think they are allowed to be raped, it's a violation and a crime.

I think perhaps you're thinking to ask why did God allowed them to be rape, I would be the 1st to tell you, No, God would not be willing anyone to be raped.

But why it did happened, as I've said, it's a fallen world.

I don't claim to know everything there is about God but I know a little of which I will try to help you understand.
John 18:36 (NIV) - Jesus said, "My kingdom is not of this world. If it were, my servants would fight to prevent my arrest by the Jewish leaders. But now my kingdom is from another place."

This the evidence verse in the Bible.

We believe Jesus Christ is God represented, meaning to say whatever He says, is basically what God the Father says.  This verse in John 18.36 helps us to understand this current world is not's God's Kingdom else God would have intervened and acted as stated.

However I believe..God is sovereign and omnipotent towards people who are serious with Him, people who will adamantly stick out their faith towards God no matter what. People who are genuine, having a n honest relationship..people who dare come to God despite of their flaws and weaknesses (not claiming people who are 100% holy or 100% perfect). Such I believe...can have miraculous grace with God..meaning having his protection and blessings.

but as to why some who may be... Christians but don't have such grace...I wouldn't know why, Only God's knows the real reason. Perhaps it's faith problem, perhaps there is unforgiveness in their life, perhaps there is something in their life that allows spiritual enemies (devil) to attack, perhaps this and perhaps that. Point is...it's between them and God, we will never really know.
As for your last question, yes it's possible that people will be so hurt they make a resolution to never return to God. Yet at the same time, nothing is impossible, there is always hope even for people who are extremely angry with God. I believe there is always hope.