Religion is just a belief as to how one can be rewarded after their life. I agree that it's inherently flawed as it makes idealistic assumptions about life itself, but it's fundamentally still a belief. Any parent should be allowed to teach their kid whatever they desire within the confines of law, and I believe religion should be exempt from any law. Grooming them and being creepy? Yeah, that deserves to be classified as child abuse. But teaching them a religion which will teach them how to be a (mostly if not entirely) good person which will benefit society in numerous ways? I think that's excellent. You might not agree with it, and it technically may not be objectively true, but as you're an anarchist who literally thinks that laws are bad and anyone should be allowed to do what they want, shouldn't you at least concede that people should be able to do what they want in that regard? Furthermore, outlawing organized religion implies that the government that will stop it inherently knows what is true and isn't. This is bad. The government has proven several times that it has been wrong before. So enforcing its beliefs (which oftentimes are subjective) on the people is against freedom and letting people do what they want. I personally believe that the government should attempt to have at least of a political opinion as it possibly can. Maybe to the extent of recognizing historical genocides the Holocaust, but that's it. In 1984 there is literally a "Ministry of Truth" dedicated to calling its subjective, authoritarian beliefs objective ones.
Here's another thing: You can't prevent horrible things done by inherently horrible people, like child abuse, and you can't have things to mitigate that, like Child Protective Services, without having an overreaching organization to manage that sort of thing - and now you basically have a government. I agree that most laws tend to restrict people. For that reason I'm a libertarian. But you absolutely cannot have a properly functioning society if you let people decide what they want. For example, murders would skyrocket. And murder actually infringes on people's freedoms, since it obviously stops them from doing what they normally want. So in some cases, a government can actually be beneficial in providing freedom to the individual.