I think they are going to go after the Catholics too (actually they already are), from a purely objective point of view, the sheer size of the Catholic Church makes Catholicism a target.
In the end, I think it will be Catholics, Evangelicals who will stand united and be imprisoned together as we joyfully await our Savior's return.
I suspect that they will have already identified RC and Episcopal CONGREGATIONS which are more BIBLICAL in thought, teaching and practice vs buying into and supporting the globalist one religion fits all idiocies.
There are a lot of liberal congregations in the traditional denominations. Those they will leave alone for a long time as such congregations help their cause.