A very large number of Christians just don't seem to understand what Jesus message was, and so even though they are Christians, club members, don't seem to follow his teachings, while lots of folk who are not in the club, do follow Jesus teachings.
God is the International President of the club and Jesus is the Chairman of the membership committee. He is the ultimate arbiter of who is a member and who is not.
Some will come to the convention with counterfeit membership cards and they will be barred, even though their chapters told them they were members in good standing.
Even more surprizing is when the membership committee goes out and brings in people off the street who didn't even know they were members.