I don't understand why someone who doesn't belive in God would wish to belong to a church or even go to one unless they have some doubts about their own disbelief. Any church has the right to admit or refuse membership based upon their own doctrines. I don't go to my chuch to debate. I go to feed my spirit in Communion but then I'm old school Anglican and nothing much ever changes there except light bulbs.
Jensen craves attention. He got some by declaring himself an atheist and joining a (supposedly) Christian church, and then writing about it in a leftie rag for all his atheist buddies to guffaw about. The "pastor" of the church let him join for similar reasons.
Two more interesting questions are why would any Christians go to this church, and why would the presbetyrians put up with it.