Evidence is not enough. Pantheists believe nature is God. Does nature exist? Of course it does. But the irreligious and atheists don't consider nature to be God. Not only do you have to prove that it does exist, something which is the supernatural cannot be falsifiable or tested by any measures. Even if you were able to prove that a supernatural monotheist God does exist, you would still have to prove to other people that the God is worth recognizing or validating, in accordance to the evidence you provide. There are plenty of people out there who do believe that God exists but still wish to distance themselves from honoring or worshipping that God. Myself included. I am a Synverse Shaper, the God I have learned exists is The Synverse, and instead of worshipping or praying to it, I actively do my part to develop and shape parts of it myself, making it more divine as I go along.
You know that the Baha'i Faith actively says that work itself is a way humans can worship God, I just go one further by explaining that it is our good works that makes God divine. i can demonstrate my concept of the Synverse as an explanation of the natural world, but I cannot force other people to use that word, or for others to consider that they are shaping that God, developing its divine traits. Yet we are all doing this nonstop every day as part of being alive as human beings. Demonstrating God is infinitely more difficult when God itself doesn't wish to reveal itself to the natural world, is what the monotheists claim. Saying that some people have the gift to communicate with God and others don't hurts your credibility. On the other hand, the the concept of the Synverse is ambiguous and can mean a lot of different things to different people. The Synverse is both personal and impersonal, it can be measured, observed and tested, and people can even change the Synverse.
Yet telling an atheist, or a member of the Baha'i Faith that the Synverse is God isn't going to do much help because not many people even know what my concept of a Synverse is. A Synverse is any point where creation happens; THE Synverse is the point where the creator and the creation are one and the same, and THE Synverse will exist after The Omniverse's development creates a breaking point which it itself becomes both the creator and the creation; the painter and also the work of art you see before you. I can demonstrate various Synverses and predict the upcoming and ongoing Synverse that is the human evolutionary race, through our DNA.
But unfortunately only me and the other Earthseed and Syntheist shapers really know or understand this God that will soon develop. The saddest part about this is by the time The Synverse is created, so many synverses will already be made that people will have a hard time identifying that is God - but nonetheless it shall be. Nature will be human and human will be nature. That is our role in reality: to anthropomorphize it.
Most people just haven't caught on to that trend yet. Hindsight will catch up to them, one day.