The only way this will work is - NO indoctrination of children into Religion, communism, capitalism, nationalism, multi-culturalism, veganism etc etc until old enough to make up their own minds. (As parents couldn't be trusted to do this all kids to raised by the neutral state).
Everyone to wear uniform - the same uniform and the same haircut and facial hair. (No religious symbols).
All education run by the state and all teachers forced to teach without reference to religion, (this would exclude most history and literature as it wd be impossible to teach). But who needs it?
Committees set up to rule on what could and couldn't be done. (OP could be on one!)
Bodies to police the internet and all other interpersonal comms - just in case
Committees to define "religion"
Invisible men - inc Santa Claus, The Easter Bunny, "The Government", "They" (As in "they wouldn't let that happen" , Amazon (that magic God of All Things), the Bank/ Pension Fund Manager who promise to pay..... (and we believe, we have faith) etc etc, all banned.
And all the other countries in the world would be delighted to take all the people from here who didn't want to live like that.
I'm beginning to enjoy this! Such fun times ahead.