I was a Mormon for several years when I was young. I met and married my first wife as a Mormon. Some of the nicest people you could ever meet, but it's 100% a cult, and it's all about control (as it is with all established religions). When you start going to a Mormon church, especially if you were some sort of Christian before, they're very good at not saying too much to scare you away. You'll hear "Jesus" a lot, in the beginning, and not so much "Joseph Smith". After you've been there for awhile, that changes. Testimony day becomes more about someone publicly stating they believe Joseph Smith was a true prophet, and Jesus becomes just a bit player.
They've very good about keeping the ritual aspects secret when you're new. You won't hear about the underwear, or being "sealed" to your wife and kids in the temple. You definitely won't hear about white salamanders and such for quite awhile.
But then something happens, and they decide you're ready for the entire crazy train. There's a big push to go to temple for various rituals. Now, I lean towards ritual magic pretty hard, so I obviously have no problem with ritual and understand that it can hold power. However, people are different when they return from the temple. It's truly weird.
Most people obviously know about the "magic underwear". I never really had a problem with that, to be honest. If you haven't been to temple, it's very difficult to get anyone to answer questions about the underwear. I finally did get someone to answer me. He told me, the underwear has symbols sewn into it, and it's meant to remind the wearer of the vows they took at the temple. The underwear isn't "magic", it's an intimate, daily, constant remind of whatever the hell it is they agreed to during their temple rituals.
I could never get any first hand details about what happens at the temple. Even the guy I got to talk about the underwear was a full stop once I asked those questions, and I'd been at the church for at least a year at that point. I hadn't been to the temple, tho, and that's the price of admission for that "secret" information. I never went and I eventually left due to what happened with my first wife.
Of course, you can find a lot about this stuff by googling now, but this was decades ago. There was no public Internet. I was still running a local BBS. The only thing Non-Mormons in the Eastern part of the US knew about Mormons was they had a nice choir.
I was dating a Mormon girl, and (oops) she got pregnant. She was 18, so a legal adult. As a nice brainwashed young fellow, the only valid response to this in my mind was to marry her. At this point, she was staying with me.
The church found out and got her mother to come over and pick her up for breakfast. Instead, they took her to the Bishop's house (in Mormonism, a Bishop is the leader of a local congregation) and locked her in a room and refused to let her leave. I had to physically go to the Bishops house, refuse to leave until he heard me out, and convinced him.
In hindsight, I wish I hadn't married her, but that decision ultimately led me to Jaide, so it's hard to wish something didn't happen when it led to the person that makes me the happiest.
That was the end of my involvement in the Mormon church. They have deep community ties and even with outright kidnapping (she repeatedly told them she wanted to leave), it's near impossible to get anyone to do anything against them.
I spent most of my younger life in a Pentacostal church. I even went to Zaire (when it was still Zaire) as a missionary when I was 16. Now those people... they aren't subtle like Mormons are. There was a week long "boot camp" we had to go through before flying out of the US. Ironically, they heavily covered 2 cults and how to convert followers of those 2 cults. To them, that was the Mormons and Catholics. Catholics were never referred to as "Christians". Baptists were, tho.
The Pentacostal church takes damaged people in, especially single mothers, uses them up and spits them out even more damaged when they're done. It's definitely a cult. It's very hard to leave a church. You'll get constant phone calls, visit from church members. Some Pentacostal pastors are batshit insane and super controlling.