The base of religion and theology (also theism) is belief respectively faith. The German word for “belief” is “Glaube” (and “to believe” = “glauben”), and this has its roots in the the term “FÜR WAHR HALTEN” - HOLD FOR TRUE (ACCEPT AS TRUE) -, so that one can also say that philosophy, science, and something near have also their roots in what religion and theology have their roots; but science and philosophy are more elaborated and "higher than religion and theology. For belief there are also two sides and ways: (1.) a practical side and way and (2.) a theoretical side and way. (1.) The practical belief leads to religion and perhaps, if becoming an elaborated form, to science; (2.) the theoretical belief leads to theology and perhaps, if becoming a higher form, to philosophy. All cultures have this sides and gone this two ways but differently. When Westerners are saying that there is “a huge difference between religion and science and between theology and philosophy”, then they are saying more about themselves and their culture because that difference is not as huge as they always assume.
Theism is merely the ideologised form of theology. Antitheism is just another theism. Theology is the theoretical side and way (=> 2.) of belief, the belief in God (“θεός”, “theós” «» “God”). And if you don’t want to belief in God, then you can call yourself “disbeliever” but not “antitheist” because an antitheist is just another theist, although or because of the attempt to become a disbeliever. Because of the fact that antitheism refers to theism and although both fighting against each other both a parts of Hegel’s dialectic process and have to bow to it, thus became a synthesis, and in the case of theism there can merely be theism as the thesis, antitheism as the antithesis, and syntheism as the synthesis. And one can easily guess what syntheism is.
He was being approximately as sarcastic as I was being (here). 