God is the singular omnipotent being of the Judeo-Christian faiths and regarded by such as the highest power beyond the universe by followers of those faiths. Unlike most figures known on Earth as gods, Teal'c doesn't believe that the Goa'uld have impersonated the Christian God, as the Goa'uld are simply incapable of the compassion and benevolence this would require.
When the Destiny expedition found the planet Eden, Dr. Robert Caine believed it had been created by God for them to find. When Lt. Matthew Scott asked Dr. Nicholas Rush about the Cosmic microwave background radiation he replied (rather sarcastically) that the CMBR could very well be a message from God, the The Almighty creator of the universe. (SG1: "Demons", SGU: "Faith", "Malice")