>>40527849 (OP)I think it would help if you re-contextualize what LHP and RHP are. Or at least I find my understandings to give me an easy answer.
LHP isnt simply about breaking convention. LHP is about forging your own way. Extending the "path" metaphor, a RHP is well cut through the brush, easy trod and predictable - many many others have gone this way, and you know it a successful way.
LHP is looking at the brush and going "I think there's a way over here, too," and forging through on your own. It may look like breaking convention to RHP, but it is still going for the same success, just in a way not done before.
Thus, if a LHP becomes well established as successful, and develops a "proper way" to do it, that grows into a RHP. That would be Christianity. That would also be some people that do aghori sadhana, or follow LaVey or Crowley. You are no longer looking at the brush, and finding a new path that others have not trod. You are no longer LHP.
LHP is "dangerous" because there's no guarantee of success. It takes a very powerful person, and just because one person can do it, it doesnt mean others can. Not even about ability, simply about the nature of spiritual practice. Not all LHP successes can turn into a repeatable RHP.
Pulling it back to your topic: I would say Christianity and Islam both started as LHP deviations from Judaism, and have developed into RHP doctrines and practices, and now both have their own LHP practices springing from them.