Is it permissible to enroll in a paid course to learn English in a lecture hall designated for that purpose in a church in America, with two male instructors and learners who possess a good degree of Islamic awareness?

It is permissible to enter the church to attend the aforementioned course if its people permit it, and there is no reprehensible act therein that the entrant would commit or condone. This is because the fundamental ruling regarding entering churches is permissibility if permission is granted.