I think two of the kids I coach might be in a religious cult??? Looking for opinions.

I work as a bike coach for kids (mostly ages 6-12), and there are these two siblings (10 and 12) that have been giving me a weird feeling. I'm not trying to diagnose them or say every strict religious family is a cult or anything, but some of the stuff they've said has me wondering if they're from some really high-control religious group.

The first thing that caught me off guard was they told me they have 12 siblings. One of them mentioned he was about to become an uncle, so I asked how old the sibling having the baby was. They both said 45. Then I asked how old their mom was and they said 57, and their dad was 68. The math obviously doesn't make sense so I'm assuming they either got the ages wrong or there's something else going on there.

But im mostly concerned about how they talk about anything vaguely related to religion.

We were doing one of those little icebreaker discussions with the kids and asked everyone what their favorite holiday was. Another kid said christmas, and these two got really uncomfortable. They told me christmas was "for the devil" and then immediately said they weren't allowed to talk about it. I asked why and they said the last time they talked about it they had to move schools and they didn't want to get kicked out of bike camp too.

Another time another kid jokingly told me I "talk like a boy." These two absolutely lost it and started telling me I was going to hell. They seemed genuinely upset, not like they were just trying to be mean.

The thing that actually worried me happened a couple days later though. One of them crashed his bike, scraped his knee, and instinctively yelled "oh my god." Right after he said it he looked terrified and started begging me not to tell anyone he said it. I told him I wasn't gonna tell anybody and that I didn't care, and he looked genuinely surprised.

They're also just really shifty about certain topics in general. They'll randomly stop talking and say they "can't talk about it" or that it's "for the devil."

I'm not planning on questioning them or digging any deeper. I'm just wondering if this sounds like kids from a really strict religious household, or if these are the kinds of behaviors people see in high-control religious groups (google told me this was a more appropriate term lol).

Has anyone worked with kids like this before? Am I reading too much into it or do these behaviors stand out to anyone else?