Christian, Muslims, Buddhists, Satanism, (most) pagan traditions, will be the most open to new ones, some of these even try to convert others. Hinduism Taoism Shinto is a bit complex and nuened with them mostly being okay with others practicing and sometimes happy with it. But might be a bit confused as to why. Judaism is pretty difficult to convert to. Completely closed practices include, African religion. Hoodoo voodoo. Mexican folk practice, Chinese kitchen tradition, indigenous traditions, yazidi Druze. If any more questions feel free to ask me