Kind of missing the point. The only way it can be proved to yourself is throuh deep mystical experiences which are completely subjective and private to yourself and can't really be shared with others. You can tell them about it but that doesn't make it true to them and they need to find their own way (or not) to verify it to themselves.
The last time I experienced a really strong connection with God was about a month ago after I had a very strong trusting thought and it was like I was lifted up by this powerful energy and surrouded by this protective energy field. It just drowned out everything else and everything just seemed very unreal and irrelevant in comparison. Because it's all made up by much weaker energies which don't matter as much in the great picture and only have temporary, or illusory, existence.
But being completely drawn in by the illusions of this world to the point you can't see beyond it (also including "religious texts") doesn't really make someone "realistic", or only in their limited material outlook.