Politics and religion go hand in hand.

"The 115th Congress was sworn in on Tuesday (1/4/2017), and once again, not one of the 535 members of the U.S. House or Senate has stated publicly that he or she doesn’t believe in God."

It's funny but not so much. Religion and politics are joined at the hip. I think religion was/is generated out of politics, the great man became a myth, an icon, a sovereign who developed a religious class as a tool to justify a divine right to lead. All our laws, the Bill of Rights, our currency, owe a debt to religion. So it's not surprising for Trump to present himself as defender of the faith.

Republican's tow the line, the party line. Recent poll indicated 87% of republicans support Trump and republicans represent 44% of registered voters.
They present a unified front. The Democrats on the other hand are like cats, which can't be herded. Putting their fate in with a well known and problematic couple only dumbs them down in my opinion.