Before we accept an idea as true, we need some way for us to discriminate truth from non-truth. But before we can do that, we need to have some understanding of the idea in question.
If I say that I have seen a UFO, you may or may not believe me. But if I tell you that I consider any object in the sky that I can’t identify to be a UFO, you would be much more likely to believe me, for my given definition of a UFO. The point here is, that before we can discover truth, such as the existence of some thing, we first have to know what the thing is that we’re talking about. We need to agree on a definition. Otherwise, we may not be talking about the same thing, and misunderstandings will result. This is often the case when we talk about Gods. What is it that we are discussing when we talk of a God? There are many descriptions of many Gods, and different people believe different things about the Gods they believe in. What are the attributes of your God?