https://www.prri.org/research/american-religious-landscape-christian-religiously-unaffiliated/
Lots of charts and details at the source.
EDIT: Bonus!
Among the major findings:
- White Christians now account for fewer than half of the public.
- White evangelical Protestants are in decline—along with white mainline Protestants and white Catholics.
- Non-Christian religious groups are growing, but they still represent less than one in ten Americans combined.
- America's youngest religious groups are all non-Christian.
- The Catholic Church is experiencing an ethnic transformation.
- Atheists and agnostics account for a minority of all religiously unaffiliated. Most are secular.
- There are 20 states in which no religious group comprises a greater share of residents than the religiously unaffiliated.
- No state is less religiously diverse than Mississippi.
- The cultural center of the Catholic Church is shifting south.
- Jews, Hindus, and Unitarian-Universalists stand out as the most educated groups in the American religious landscape.
- Asian or Pacific-Islander Americans have a significantly different religious profile than other racial or ethnic groups.
- Nearly half of LGBT Americans are religiously unaffiliated.
- White Christians have become a minority in the Democratic Party.
- White evangelical Protestants remain the dominant religious force in the GOP.
Lots of charts and details at the source.
EDIT: Bonus!