Actually, that might improve things here when creationists accuse supporters of evolution of being "agnostists", "athesists", "scientism" and "new age" when their profile clearly states their ACTUAL religion.
Then the mods would be more justified in banning people for trolling and flaming when insist anyone who disagrees the world is over 6000 years old is "not a Christian"
If we're talking about believing in evolution as a denominational or personal difference among people of different faiths or denominations (including atheists and agnostics) then I believe the proper term for it in a theological context is "schism". Kevmo rejects outright any consideration of it on those terms.
Considering it a religion by itself, separate and apart from Christianity or any other faith is the exclusionary approach - it justifies and provides a tacit agreement that the arguments that you cannot believe in evolution and call yourself a Christian are valid. Christians are not polytheistic.