Why?If I ever decided to go back to monotheism I would need to do a lot more research about the various faiths. Based on your selections I would probably look really close at Gnosticism and Baha'i. Odds are though I would go back to Roman Catholicism. My family is Catholic and I was once Catholic. I would be doing my own thing within it though. I probably would have more Deist viewpoints or even retain my Nature=God belief.
I mean, it sounds like your position would be considered heretical in the Catholic context, so why voluntarily align yourself with a church that would implicitly brand you a heretic?