I don't think he is rejecting its existence, he is just sayin the concept is unreasonable and something people should reject.
It may be something people should reject, but sadly its becoming more and more common. Groups like the ELCA, NCC, UMC, PCUSA, are desperately seeking "interfaith unity" while sacrificing their core beliefs in the process. In the end times, during the tribulation, the anti-christ and the false prophet will trick people into "worshipping" in a single world-wide church, after all. It is not going to get better, only worse.