The problem with religion interfering is not what kind of theories they have, nor how whacky those theories are. The problem arises when they try to displace scientific theories with their own theories, which they believe are just as plausible.

For example, I have no problem with people who believe that (a) god(s) created humanity. Teach it in schools too, I don't care all that much(just don't ask me to do it). The problem arises if they want to take out evolution, for example. That's completely unacceptable. That's child abuse.