Easter is about atonement and renewal.
Has Congress ever passed a resolution proclaiming that?
The big difference between Islam and Christianity is that true faith comes from God, not from man and reconciliation never involves the reconciliation of God to man, but rather man to God. Per the second chapter of Ephesians, Christianity is the only true faith which provides peace and removes the barrier between God and man.
If a Muslim is searching for the religion of peace, he needs to read Ephesians Chapter 2. Besides, it was written 600 years before Mohamed ever lived.
Christianity is implicit in Western Civilization. They might just as well issue a proclamation about the existence of gravity.
It's who we are. If only we'd live like it.