Your opinion on "false theology", and it's only that, is truly noted. My experience is that so many who take this position really do not understand the basis of Catholic theology, nor do they know much at all about church history, nor do they understand the point-by-point intricacies of Catholic theology, and nor do they understand that any theology in general is highly subjective.
I know enough about Catholic theology to know they are wrong in many areas. The hold their non-Biblical traditions equal to Scripture and that is adding to Scripture which is forbidden. They are a very legalistic denominating and legalism is false teachings.
When the current pope and other before him say, Protestant churches aren't real churches, I lost all respect for him and he is the best one they have had for a long time. There is also a basic non Christian principle broken when priest would not report the sexual misconduct of other priest.
To put it another way, usually they're quite effectively brainwashed as I was when growing up in a fundamentalist Protestant church.
You don't really know what a fundamentalist church is, but I will tell you this, a church can't brainwash you if you stick to what the Bible says. I will acknowledge, it is hard for kids to reject the religion of their parents, It usually happened when they get older. I know what you mean by a "fundamentalist church." and they are a disgrace to Christianity, and you did the right thing by leaving it.
The reality is that the church is still growing here in the States, according to the last figures I've seen, but only because of immigration.
The church is growing in several parts of the world, just not in America.