Is it because of your inability to believe in anything that can’t be explained by science?
I value science and believe that it is essential and beneficial for learning about the physical world, but I doubt that scientific research will ever be able to logically prove the existence of deities or anything else supernatural. In fact, I don't believe that modern science (or religious dogma, or religious texts like the Bible and the Quran) will ever be able to rationally explain or logically debunk the genuine supernatural phenomena that occur in the physical world.
Maybe science will catch on someday, but I'm not holding my breath. Honestly, I'm not sure if deities exist because I've never seen any conclusive evidence that has convinced me or felt the presence of one in my life, even when I was a devout Christian for 30 years or during the 40 years I genuinely believed in the biblical God. So I don't believe that there is sufficient empirical evidence for any deity. This lack of empirical evidence prevents me from believing in deities. And while I practice Wicca and Druidry, I acknowledge that I lack the empirical evidence or any other alleged evidence that deities actually exist.
Having said that, I think it's possible that they could exist while acknowledging that I can't prove or refute their existence. I've always been fascinated with spirituality and beliefs in the supernatural, but I'm not willing to state that I am fully confident, beyond a reasonable doubt, that the biblical God or any other deities actually exist. I'm not all-knowing and all-powerful, and I can't be in all places at once or explore all of space and time. I don't think that I can honestly establish whether there is only one God, if there are other deities, or if there aren't any deities at all. Therefore, I'm an agnostic, not an atheist.