I‘m not familiar with the whole part about trying to stop the seed of Christ or the 3 year old prophet who went to heaven, but the whole angels mating with women thing sounds a lot like theyre talking about nephilim, which are briefly and kind of ambiguously written about in the Old Testament. Some people think that angels mated with females and their offspring were these giants called nephilim who were great warriors. Some people think that Goliath was one of these nephilim. I’m by no means a scholar on this subject, but someone I knew in college was unhealthily obsessed with this topic and so I’ve heard a decent amount about it. I wouldn’t ever base any part of my core theology around nephilim bc it’s really just kind of vague. Here’s a brief synopsis on where it comes from in the OT:Seriously though, is this like a thing in the area? Or are my parents on their own program and crazy talking? Anyone heard of this stuff?
As far as the whole situation, I’m sorry it’s causing stress in the family. I would definitely suggest sitting down in person (or via Zoom or phone) and talking with your parents and discussing your concerns.
Also, as a Christian, I’d strongly encourage you to not let this push you away from the faith. I think we’ve all seen people or churches that adopt strange theology or frankly just false doctrine that is bizarre. In spite of that, that doesn’t diminish my love for Jesus or waver my belief in him. As other posters have mentioned, being involved in a Christ-centered, theologically sound church is such a great, life giving thing.
If you’re not sure what you believe or don’t know where to start in regard to finding a church, I’d recommend looking for a church that is running an alpha course in your area. They’re free, they’ll feed you, and it’ll provide a safe, non-judgmental place to ask any questions you have about the faith. My wife and I went through it and loved it.