I personally think that Thelema will grow, rather than suddenly arise as a religion out of the briney, such is seen in other beliefs around the globe - they often take time to develop, and along with that development many trains of thinking and interpretation.
As such you will most likely end up with various sects as prophet after prophet rises. Different groups within society will be drawn to whichever prophet speaks on their level.
So you will have Thelemites who are largely a development of Christianty, yet you may also have groups who are more Pagan based in their interpretations etc etc.
The Law is for all, after all 😉
Rev.D