Christianity is a religion on Earth. It's holy text is the Bible. Teal'c has concluded that no Goa'uld is capable of showing the neccessary compassion to impersonate Christianity's God. Sokar instead impersonated the Devil, the enemy of Humans in Christianity. (SG1: "Demons")
Robert Kinsey is a strong follower of this religion despite the fact he doesn't appear to follow most its moral principals. (SG1: "Politics", "Chain Reaction") Samantha Carter may be a Christian as well, but there is no conclusive proof of this. (SG1: "Bloodlines", "Threshold")
Cameron Mitchell has desribed his grandmother as a Bible-thumper, implying that she was very religious. (SG1: "Origin")
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