I'm a bit fuzzy on the dates, but IIRC, the New Testament was written by Matthew, Mark, Luke and John not more than a century after our Lord and Savior ascended into Heaven; that would put it, mas o menos, around 150AD. The false god of islam didn't rear its ugly head from the Arabian desert until about 632AD, if my posters from Saudi Arabia are to be believed.
Please correct me if I'm wrong.
No, St. Mark's corpse (read relic)