So we've already established that most religions can be classified as high control groups
I can't say I agree with your premise.
I think most denominations of christianity probably don't qualify as being a cult in my mind - even though all use some of the same methods of control as cults do. You'd be well served by thinking of cult more as a spectrum - some groups are more or less culty but all are at least a little culty.
I think you'd be hard pressed to find any group that doesn't exert some form of control that's similar to methods used by a cult. Because cults use an amplified version of social influence to control people, you'd expect to find diluted versions of those methods in any social interaction. So, yes, literally every religion (and bridge club or book club or workplace or political party) will have some elements of cult influence, but in most cases these do not go to the point of becoming what we would usually identify as a cult because their influence hasn't gotten extreme. Maybe if you leave your book club you won't talk to those people as often, but they won't shun you completely. Maybe members of a political party discourage spending too much time investigating alternative ideologies, but they won't kick you out if you do and come back with new ideas for discussion.
Edit: it might be worth adding that I say this as an atheist: just because all religions are factually wrong, doesn't mean they're a cult.