I wouldn't support any religion attempting to force circumcision on non believers.
Babies are non believers. Children are non believers. In fact, 'object permanence' - the stage in a child's development where they understand the things that are out of sight and not gone forever - isn't truly established and cemented until around 3.
So if a child doesn't understand that it's toy still exists if it's not in the room, how can you possibly expect them to comprehend a God that they can never see, or understand the practices that they're expected to adhere to in order to worship them?
I'm sorry but I think circumcision is an awful practice- especially on children- and should only be used as a medical treatment if absolutely necessary.
As a side note, did you know that it used to be customary for the rabbi to suck the blood from the penis after the procedure? Do we still do that because it's part of an ancient text?
If you truly support religious freedom you support homophobia, the patriarchy, the banning of contraception, the refusal of many medical practices- even lifesaving ones like blood transfusions, the murder of those who don't practice the same faith and non surgical intervention during labour as the pain of childbirth was punishment to womankind because Eve fell and should be suffered as such.
Most people on Earth will need/use/experience one or more of the above in their lifetime. So which do you support? Religious freedom or a safe, comfortable and healthy life. Because I can safely say the two do not go hand in hand- and I am a firm believer in God.