Consider this: perhaps the reason it does not make sense to you why God would create us this way is BECAUSE we are created this way, and we just don't have the ability to comprehend why. If there is a God, then you must admit that He knows infinitely more than us. Then you must admit that if there is a God, He created us, He knows infinitely more than us, and thus He must have a REALLY GOOD reason for making us this way.