One way of seperating yourself from a religion is by simply not taking on its obligations.
I, for example, did not conduct a Bar Mitzva, which is, in fact, one of the main indoctrination cermonies, if not _the_ indoctrination ceremony, of Judaism. I also do not keep the Kosher laws, or any other religious laws, for that matter. It is that simple, even if you did do a Bar Mitzva. You simply stop adhering to religious laws and obligations.

Seperate yourself - maybe. But you can't actually get rid of it. It's like a curse.