I don't think that I believe in a "higher power" though I don't really know what a higher power might or might not mean. Like 'God' it is such a broad and ill-define term that it is next to useless.
I consider myself to be an agnostic atheist to the general term of God (or Higher Power), I have seen no proof of it, have therefore no reason to believe in it but I am open to fact that. someday, someone might provide some evidence to prove that their God (or Higher Power) is real.
However I have dismissed totally all the Gods and 'Higher Powers" that have so far been put in front of me. The evidence put before me has not been convincing in the slightest.