I don't think that aikido was ever meant to contain all the answers — it was just meant to open the door.
Aikido has a lot to offer, and my life is much richer for it. Aikido is deep and infinite. It's also compatible with most mainstream religions, and, if practiced properly, those who train in aikido can become highly adaptible and tolerant, expanding the depth and breadth ot their religious convictions.
I think that of all the martial arts, aikido is one of the best choices for those that are also involved in a spiritual quest.