I agree. If you don't want to be part of it anymore, leave. Immediately.
It has a far bigger impact ultimately than trying to stay IMO. Ultimately, you could have 99% of people not believing and going through the motions which would effectively be keeping the other 1% trapped.
Just walk out and don't go back. Taking part in it is helping to perpetuate the system and keep it running, however much you may intend to try to stop it, you're still part of it.