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Yeah, New Testament should be around 600 years older than the Qur'an. The Old Testament should be much older. But it's historically proven to be changing with time. (Just look at comparison between New Testament scripts from different centuries.)

Jesus spoke Aramiac, and the oldest Bible manuscript we have is in Greek, I believe, (I may be wrong,) so that alone may raise questions about how accurate it is, compared to what Jesus told his people.

Qur'an was revealed with stories that we as Muslims believe to be the "correct" unchanged versions, that should've been in the first Bible. But who knows? I believe Islam is true, because of my life experiences, so I believe the Islamic version of stories to be more accurate.

Yes but there was many copies of the Quran that were burnt to end controversies. Islam is a religion of force. Hence, Constantinople is called Istanbul. Christianity spreads through miracles and martyrs. Love not force. God is love.

Islam acknowledges that force can (also) be used for good.

As for the burnt Quran copies, Qur'an has different readings, and the Arabic writing was not standardized at first. The books that were burned are Mushafs (Qur'an books) that were written in a different way than the standard.

Still, the main way Qur'an was preserved is via Oral Tradition, and there are multiple ways it could be read, but (as far as I know,) they're not contradictory, and complement each other, both in sound and meaning.

Here's one video I liked about different "Readings" of the Qur'an:

Speaking of different ways to read Qur'an, my aunt has learned at least two of them, and if she lived long enough, she strives to memorize all of them from memory.