Surah 5:68 reads...

Say, "O People of the Scripture, you are [standing] on nothing until you uphold [the law of] the Torah, the Gospel, and what has been revealed to you from your Lord." And that which has been revealed to you from your Lord will surely increase many of them in transgression and disbelief. So do not grieve over the disbelieving people.

If the Koran is saying to trust in the OT and NT as it says to do here then why are Muslims accepting the Koran which comes six centuries later after the cross that says Jesus never died on the cross and was never resurrected?

So we know Islam is false.