To be fair, one of the reason why the Portuguese came is to spread Christianity but it's not part of Crusades which have ended. However, the main reason is still good old $$$. Spice is fetching high price in Europe and they don't want to depend on Arabs anymore. They are also looking for ways to trade with China. The statement to say their main purpose is to destroy Islamic government is totally wrong.

LOL! looks like we are having mini crusades here.

As an outsider, both religion had violent history. Both used the sword directly or indirectly to spread the religion. The only difference is Christianity have evolved while Islam is still basically stuck in the 16th century. Initially Islam was the more progressive religion. Christianity gone through a horrible stage of insanity such as Inquisition and Crusades but came out more progressive. Christians realised the importance of separation of religion and state. Muslims might have won the Crusades but they lost their progressiveness along the way. In the long run, Muslims lost more because of the Crusades and that is why they are still bitter with Christians to this day.

As for colonialism, it was all due to greed and $$$. Yes, religion was the side purpose of colonialism but it was never the sole purpose. Therefore, the Malaysian history books was wrong to say the whole purpose of Portuguese invasion was to destroy a Islamic state. It should say one of the reason for the Portuguese invasion was spreading Christianity. After all, the Portuguese did not force Malays to convert to Christian because they have learned a hard lesson that forced conversion don't really work. Nevertheless, some of the tactics employed by Colonialism to spread Christianity is not angelic either.