But, not the whole thing is corrupt. Actually, most are just replacements of words and mis translations.
But I met a guy on youtube who told me some gospels are man made.(christian) (I don't remember which, and he failed to answer why specifaclly these)
He hated the catholic church but failed to ignore a trinitary concept... So we need to use bible
It's useless to talk about quran to most non muslims for in the first place they don't believe it's the word of God anyway. Only a few that wants to learn will take in consideration what you will say about the quran. (look at the comment on your page)
U need to come with logic, and some verses of the bible...
For example, when people say there are 3 gods and these equal 1. U don't need to link them the quran where it says Desist of saying trinity.
But rather, link them just a few passages from the bible that is against this... This will make them think and take consideration for what they know...
Most will ofcourse roll in rage :D And after THIS, when they read quran, it'll become clearer for them.
That's the best way because Allah choses who he guides and who he does not.
U can be the smartest, best person alive, but if Allah doesn't want you to see light, U will never.
We can proof him the quran is true, still he will not believe.. right?
(in bible also god says only he choses those who are guided)