Why confine oneself to picking and choosing from other religions? If one is that astute, why not just whip up a batch of homemade religion from scratch? It'd be just as good and probably better, fresher ingredients, you know.
If one chooses one's own truth, why bother with a religion at all? You set yourself as the highest authority, so why not just develop a philosophy of life and go with that? Or why even go to all that work and formality? Why not do and think whatever you feel like at the time?
I may not have all the answers, but then I don't have to. I just stick with the One who does.