I wish I had all the answers, unsure.
I myself still have many questions unanswered. I can't tell you why there are so many denominations. I can't answer why out of the same book come out so many different interpretations. I can't answer why some have had experiences with the supernatural and others never had.
I can only tell you my personal experiences and that I really truly believe in the core of Christianity. Jesus was a man that walked this Earth, perfect and sinless, to have his blood shed for us. He is the only Savior, the Son of God, the Lamb of God, the only way to the Father.
He wasn't a mythology. He was a real man crucified under Pontius Pilate.
I tried living my life without God, and it was meaningless. Anything you do on this Earth perishes, and all your hard work, your joy, your accomplishments, your failures, come to nothing when you die. I tried living my own life, the life I thought would satisfy me. There was only a temporary satisfaction. Solomon said it best, it's all vanity, chasing after the wind.
It's comforting to know that you are never alone. That even when you have no answers left, God is the answer. If you've messed up, if things have gone horribly awry and you have no hope, no control over the situation, you still have hope and love in God through Jesus. You can hang your hat on the Rock, the eternal one.