I don't see prayer sessions for evolution. I don't "tithing" either. I don't see animal sacrifice, turning toward Mecca to pray, priests, cardinals, etc.
I don't see where priests of evolution granting marriages.
You are very mistaken here.
You seem to be defining religion by the traditions of a few. All religion requires faith regardless of any other tradition associated with it. Belief in evolution requires just as much faith as any religion.
The bible says faith is the substance of things hoped for, the evidence of things not see. (Heb 11:1)
All who believe in evolution hope that it is true and the evidence for it is unseen therefore it is a belief system like any other