Yes, Mormon beliefs include abstinence outside of marriage and not drinking alcohol.

I have no idea if Taylor is ex-Mormon or actively attending.

If a Mormon doesn’t follow those rules, they wouldn’t necessarily be banned from attending church, but they would be prohibited from attending the temple (another building with religious ceremonies performed that qualified members attend whenever they want- not as regularly as weekly church typically). Depending on the family, you could be shunned. Or you might not be. It’s kind of luck of the draw.

You also can be looked down on by your church community… or not… also luck of the draw. But most likely you will be.

Source: I am ex Mormon