Socialists infiltrated the theological seminaries at roughly the same time they infiltrated academe at-large.
They have been pushing Socialism into the pulpit and God and Jesus OUT of the pulpit for over a century, albeit very gradually and very subtly.
And, as C.S. Lewis points out, a typical tyrant is bad, but a tyrant who believes his tyranny is based in religion is about as bad as you can get.
And some of my most vicious debates over current-events issues have been with fellow “brothers in Christ” who absolutely refuse to give up their socialist world view in favor of inconvenient facts, and who refuse to consider the possibility that their interpretation of scripture has been skewed by pastors and preachers with an ulterior motive.
Beware the wolf in sheep’s clothing.
These brands of Christianity aren't organized in such a fashion that socialists can easily infiltrate their ministries. The Catholics have a high bar to clear (celibacy) while the Mormons rely on an unpaid ministry.
So a socialist is going to have to be celibate (or at least good at not getting caught) if they are going to become a Catholic priest or nun and their going to have to find an alternative method of earning a living if they are going to become a Mormon bishop. Both tend to be very high bars to clear for your average Marxist-Socialist.
The churches have a vested interest in amnesty. They see illegal aliens as members and future members of their churches. The Catholic Church is one of the worst offenders in the battle against illegal immigration and amnesty.