Note that I said creationism, not Christianity.
As far as I can tell, creationism is the belief that the book of Genesis is a literal and exact account of the beginning of the world, with the concurrent belief that anyone who says otherwise (like scientists who devote their lives to studying the physical world) is a member of some vast conspiracy. Many attributes of creationists do not align with Christians--for instance, by bearing false witness (proscribed by the Ten Commandments) when they claim that all scientists are liars who invent data. Furthermore, I think they also violate the Ten Commandments by worshipping the earth instead of the creator of the entire universe, who was very clear on whom He expects us to worship.
I was raised going to church two times on Sunday and sometimes Wednesdays and any Christian church I had been in pretty much taught and believed in a literal Genesis. I have since formed my own opinion on certain things,as many others who do in-depth study with an open mind, much to the chagrin of my folks:)