Jesus faced those same questions while he walked this earth.
He said that if you REALLY want to know if His teachings were that of a mere man, or from God (implying the existence of said God), then "OBEY THESE COMMANDS, and you SHALL know (one way OR the other)" (Referring to the Sermon on the Mount, beginning in the 5th chapter of the gospel according to Matthew)
This is a "litmus" test that Jesus gave, and He said nothing at all about having faith or believing. If you want to know if Jesus really IS the Son of God (the God who is there), (er – DO you really want to know?) then read and obey the Sermon on the Mount as found in the gospel according to Matthew, starting in the 5th chapter.
If Jesus never existed, then nothing will happen.
If Jesus was a liar, then nothing will happen.
If Jesus was a lunatic, then nothing will happen.
If the Bible is nothing more than the writings of some crazy bronze-aged, goat-herding cave men as the atheist mockers keep insisting, then nothing at all will happen.
If you flat out reject this test, then I have to remind you of some other words Jesus said. He said that the reason people reject God is “because they are evil (their deeds are evil), and they love darkness (i.e. they love their sins and immorality), and they hate the light (i.e. they hate Truth)!” I can only conclude that you're just one more in an ever increasing line of hypocrites who talk a good talk, but don't really mean a thing they say, and that the only reason you don't believe in God is because you don't WANT to believe in God, and for no other reason; and your theme song is "Don't confuse me with Truth; my mind's already made up!"