I used to believe in God and felt an actual connection to something beyond myself when I sat quietly alone in nature. It wasn't exactly a feeling, but a clearer perception of what it means to be kind, and a sharpened sense of empathy, of being profoundly connected to everything around me.
I'm agnostic. I have explored this topic with a lot of effort for at least 25 years. I have heard the logical arguments against the existence of god, and for the most part I understand it. As a reasoning person I accept it, although it isn't what I desire to think. Emotionally it was at times a grief to accept, but I want to know what i am actually dealing with in reality because that allows me to best know how to live and where to put my energies.
I don't approach it with the kind of certitude that some do. It isn't because I think all possibilities are equal. They aren't. It has more to do with being aware of my own limitations to perceive reality as a whole. The closest thing I have to certitude is that human beings are small and limited and cannot perceive the whole of reality