I believe in all Gods as a pantheist thats de rigeur, however I view them all as a human way of interacting with the divine. Some people call the divine, spirit, some call it nature, the name and form isn't really as important as the belief. It humbles and I am a better person for it, my patron, the form I use for my concentrations is Bel Marduk, as he was the only God I ever came across that didn't rule by fear or regard this planet as a kind of giant chess game for his own amusement. All gods were created by man, Edward Chiera excavating at Dur-Sharrukin famously said "God created man in his image, and we immediately returned the favour", then he died (the assyriologist, not God), tragic story
Worshipping one God and claiming all the others false is not even a question, if someone believes in a divine power then that divine power in some form exists, even if its just the belief that exists. That belief shared by many draws people together and makes them warm when they would be scared, I have no issue with that. Its what I perceive as evil, that I do have a problem with, generally, thats reserved for monotheists who use their faith to seperate humanity rather than unite it, or who use their belief as a background to being wilfully ignorant of science. If you had asked "which God do I believe exists" I would be unable to answer, no god can be said to really exist, the belief in them does