You don't need religion to feel complete, or whole. All you need is a group of like minded people that share the same goals, fears, and instincts, and the feeling of having each other's back when the chips are down. Bonus points is one of them is a hot girl that thinks you're a hot guy and you both enjoy banging each other silly every couple of days.
You may even argue, from a purely psychological point of view, that is why religious people have a feeling of "wholeness." It's not the belief in God that creates it, it's the feeling of community that is a natural byproduct from coming together on a regular basis for worship.
If you DON'T have a group like that, you should make it a point to build one.
And there's no shame in joining a church just to "belong" so long as you see the "God story" as a metaphor for something humans can never possibly understand. (more bonus points if there's plenty of horny religious girlies)