How about the Muslims setting the appropriate stage for an apology--say the return of St. Sophia's in Constantinople for starters?
(Denny Crane: "Sometimes you can only look for answers from God and failing that... and Fox News".)
Why don't we start with Muslim original sin. They can give back to Christendom everything they stole outside of the Arabic peninsula...like Syria, the Lebanon, Jordon, Iraq, Egypt, the Sudan...all of which were Christian before that pagan Muhammad brought the 600 year regression to the world.
And the crusader Saint John the Baptist in downtown Beirut.
why stop with that ? return the temple mount to its rightful owners and rid it of those 2 abominations and return all the holy sites to the Hindus that were turned into mosques