My question stands as God is self-evident to me and most people.
No two of you can agree about what it is that you are seeing, which is why atheists tend to believe that you are seeing a part of your own mind, misinterpreting what it is, and projecting it onto the world.
Here's a good question: How do we decide which is correct when one group of people tells us that they had a sensory experience of some type, and another group of people in similar circumstance say that they have not?
How about if I found myself in a world in which people told me that they could see red and green, but I couldn't. How could I decide whether it was I that could not see something that existed, or if they were seeing things or perpetrating a hoax?
Easily. I test them. I ask somebody to put a red sock in my left hand and a green one in my right hand, socks that look identical and are thus indistinguishable to me. Then I interview a number of people not in communication with one another who claim to be able to discern red from green, and ask them to tell me which sock appears red and which appears green to them.
When I get the same answer from them all, I know that they can see something I can't. When they're unable to come to a consensus and more or less half tell me that the sock in my left hand is red and the other half tell me it's green, or that both are red or green I know that they are not seeing any more than I do.
Those are the kinds of answers I get from people like you that tell me that God is obvious, or as you worded it, self-evident, and how I know that the people telling me that they have experienced a god are only experiencing their own minds. They describe multiple gods with multiple personalities, each of which happens to think just like they do.