Firstly, I have realized that, in this lifetime, I will never have definitive knowledge of what does or does not exist in this universe. I will never know if there are deities or spirits, or an energy source that unites all living things. I would certainly like to know, but I'm human and part of that condition is to be in the dark, and simply believe in what I feel is true.
Because we can never know if what we see is all that exists, I think that atheism, secularism, and humanism are the most logical belief systems. That being said, I don't think I will ever stop playing with different ideas and religions and possibilities in my mind. It's in my personal nature to seek spiritual understanding and connection, and regardless of what is real and true, I will maintain belief in what brings me comfort. I believe that I am more than flesh and atoms and chromosomes, and I believe that there is something sacred and powerful out there that I hope I will come to know one day, in another life.
When people ask what my religious beliefs are, I say that I am agnostic, that I don't know. It's true, but it's not the whole picture. It's a massive painting for me, and I will keep painting it until the end of my days.