Focusing on denominations is a bit misleading, since some Protestants are anti-denominational (i.e., they reject denominations as wrong, which is kind of like Roman Catholics, except those Protestants go from one to zero ;-).

By affiliation, Protestants make up 66% of Christianity-derived religions in the US. 29% are Roman Catholic. Evangelical Protestants alone are 36%. (Source: https://www.pewresearch.org/religion/religious-landscape-stu...)

Religious affiliation is also highly geographically variable in the US, so many places would have relatively little cultural awareness of Roman Catholicism.