Before my late wife died, she passed her Naturalization test. She never got to be sworn in.
I was reading the most recent version of the study questions for the civics portion of the Naturalization test. You can find it, along with a Naturalization self test on the U.S. Citizenship and Immigration Services website.
A quick search of the study materials brought up zero mentions of God, Jesus, and Christianity. None whatsoever.
This is because the Constitution of the United States does not mention any deity. The only mention of religion is in Article VI - "...no religious Test shall ever be required as a Qualification to any Office or public Trust under the United States."
People are losing their minds over the recent SCOTUS same-sex ruling, and claiming that America has lost its Christian foundation and that it is in its "last days" along with the rest of the world as Armageddon approaches.
But according to Christianity, we've been in our "last days" for the last 2,000 years. So pardon me if I don't hold my breath.