Whether it intends to or not, much of religion tends to breed exclusivity, along with, unfortunately, cliques and enemies.  Its divisions are usually based solely on what the members of a division believes and, we hope, subsequently puts into action.  If you believe, you're in; if you do not, you're out.
     Of course, religion could not function without sets of beliefs.  What otherwise would be the point?  The issue is the conditions on which these beliefs are based.  Arbitrary conditions create arbitrary religions, religions that create and rarely examine their own presuppositions.  Genuine religion, however, doesn't determine presuppositions on the basis of what it thinks; rather, it roots presuppositions in what it sees.  Yes, it thinks, but it doesn't think before it sees.
     If religion is arbitrary, it does little for us.  Nazism killed millions of people in the last century.  So how do we decide that a particular religion is genuine?  Though it can be tricky, perhaps one way is to ask ourselves first how we would choose to approach God, then ask ourselves how God would choose to approach us.  They likely won't be the same. If we think we know before we start, we've probably missed the point.  We have to let God be God.  After all, he was here first--and we would not be here if he were not.