I don't know if the fact that we see Fibonacci counts in spirals in nature leads to the existence of God. I guess I see that as an amazing observation about nature. Now maybe some people would argue that my definition of nature is some sort of guiding force. It is another fascinating fact about nature and our world. Whether it implies the existence of God or not is something that I don't have a good sense of.
Some mathematicians have very serious religious beliefs and many others are complete atheists.
It's funny how these things can be cut both ways.