Keep it to yourself and don’t hurt others. So long as that’s the case, what someone else believes is generally not my business.
I was raised in various evangelical protestant denominations of Christianity, went through a Neopagan period, and landed in atheist-leaning agnostic.
“Critical Thinking” was already taken, so I’ll go with my similar-but-different answer of critical evaluation of sources/information. When I was a kid, we were never to let anyone in when home alone, even to just use the phone. We were told never to believe anyone on the other side of that door that wasn’t family or emergency services (and even then to call the neighbors in the latter case). Today, so many of the same people who told me this are fooled by dis- and mis-information online or believe very poor sources. Sometimes, it does fall into the trap of “my sister/brother/pet albatros shared it so it must be true!” of thinking the source is already verifies. We all should get better at this.