According to a 2012 review by the National Council of Churches, the five largest denominations are:

The Catholic Church, 68,202,492 members
The Southern Baptist Convention, 16,136,044 members
The United Methodist Church, 7,679,850 members
The Church of Jesus Christ of Latter-day Saints, 6,157,238 members
The Church of God in Christ, 5,499,875 members

Trying to determine what the 70% of the US citizens who consider themselves to be "Christian" think about any person or concept is a waste of time.   They can't even agree amongst themselves about theology; that's why there are so many different varieties.

Trying to do that for the 15% who are atheist or agnostic isn't possible either.