1) Claim of Allah is that You can not produce a book like Quran.
Yes, and you cannot produce a book like "Hamlet", or "War & Peace" or even freakin "Harry Potter", so Allah's claim is perhaps slightly overblown in this regard.
to this day....as there is NO BOOK on this earth which is SO PURE (not being changed) even after 1400 years.
But then, you say it is unchanged only because it claims to be unchangeable. Secondly, to assume that the perfect word of a perfect being can still remain perfect after getting handled by millions of imperfect mortals living in this imperfect world over several hundred years, just doesn't seem very logically sound.
2) Claim of Jesus was that his followers will DRINK POISON and will not DIE ..(Mark 16:17-18)
By your faith, Jesus was a revered prophet of God, so suggesting that he was a liar/fraud, essentially kicks you out of your own religion, and is an offense severe enough for the likes of the Taliban to want to publicly execute you.
Everyone can see where the TRUTH is!!!
If only it was that simple.