I think, although a slippery slope is already being slid down every time Lemur posts, we can actually bring this conversation back, if there’s a slight rephrase of the OP.
In particular, we need to set standards of “abuse” and at what point this particular topic causes it. From what I know, the general legal standards for things like this involve “causing harm”, similarly, from psychology, the DSM standard for diagnosis always includes a disclaimer that it “impairs social or occupational functioning” (might seem irrelevant, but I’m merely bringing it in as examples of what constitutes something that can one can take action on)
Now, we have to determine if the teaching of faith-based beliefs causes actual harm.
I have met, in fact, people who I would say have been caused actual and irrepearable harm to their psychology and chances at living a fulfilled life due to the incredible amount of close-mindedness that their parents had instilled in them. The people who truly cannot get along with a vast majority of society due to the incredible misconceptions placed upon them by their parents. Now, this is a slippery slope, because how would one determine at what point to introduce the child to alternative theories? It’s impossible.
However, we CAN address and in fact I believe there are legal precedents, for beliefs that prevent certain necessary medical procedures (in particular, from a recent thread here about Jehovah’s Witnesses, blood transfusions) that arguably cause Actual Harm to a child who is not allowed to receive a life-saving medical procedure.
Furthermore, in the area of sexual education. I believe it should be necessary for teenagers to receive sexual education. Again, a personal anecdote about harm caused to a teen, she fell victim to the abusive notion of “if you really love me you’ll have sex with me”, the #1 “stupid reason to have sex” taught in many sex education courses. Additionally, for adolescents who fail to receive sex ed due to being opted out by parents and choose to be sexually active anyways, they lack knowledge of safe sex. Again, same person, didn’t even realize that “pulling out” wasn’t safer than condoms, because of the incredible repression of sexual education by her parents. Because of her relationship troubles above, among a few other things, she had to have counseling. Luckily, she didn’t get pregnant, but again, the chances of harm being done were increased greatly by the refusal to overcome factually incorrect “faith-based” education
All things considered, if a faith-based approach will cause actual harm when compared to a secular teaching, we MUST give children the knowledge necessary to protect themselves, regardless of what their parents think