Why do I " believe in" my Goddesses and Gods?
That is entirely based on my personal experience. I have experienced reality in a way that makes me assume the existence of multiple forms of divinity and spirit in this world.
I cannot prove this with scientific method, and I do not try it. It's just my personal reality, I don't claim that it needs to be everyone's reality nor can I claim to understand absolute truth any better than other humans.
Further, I choose to visualize and address this divinity in the guise of the Egyptian Pantheon and using Egyptian concepts. This is for personal and pragmatic reasons: this religious practice is effective for me and fits with my personal spiritual experiences. It helps me organize my life and my understanding of the world and gives me a plausible framework for all phenomena I observe in nature.
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So yes, I assume that gods and goddesses exist, and I also think that evolution is a splendid, useful and exceptionally well-supported scientific theory.