I have pondered this until my head hurts. Jehovah is as real as can be to some people. Good, sincere people believe or don't believe just as fervently as each other. There is no proving either way, just believing or not believing.
And nothing that either person says will convince the other, yet everybody keeps hashing it out. I wish Jehovah would do something just a little out of the ordinary to convince the non-believers, because if He IS there, He's helping them to make their point that He ISN'T there. Non-believers aren't being wicked or stubborn. They just don't see whatever it is that the believers are seeing.
Stillin - Wow.
Jehovah has done many things out of the ordinary. Just look for it, and some day you may see it for yourself.