I know what you say sounds reasonable at first. But parents and kids already make a huge amount of life long decisions already. You hit the nail on the head with religion. Circumcism is a life long unreversable (as far as I know) decision that is made without yhe childs consent and mainly for preconcieved religious reasons. So why is trans medical care any different. Simply because it is the minority.
And of course, when kids who really want that treatment don’t get it. Some resort to suicide. That is life long and unreversable as well. All of the trans kids I know have parents who are trying to adjust to it. Not parents who pushed them into it. It’s a lot of work, doctor’s appointments, paperwork, and fear. I would speculate that the number of kids convinced by their parents to be trans is infantessimally small. And they almost definitely don’t live in red states. So laws like this protect almost no kids in their state while causing harm to significantly more kids who actually do live in their state.