Athiesm is not a worldview but a rejection of one. As such it is allowed to rebut and counter arguments for theism by showing each argument up. As has been stated here seemingly prima facie arguments which seem contradictory but support atheism could both be true and logically valid if you add a third premise which supports them both (ie becuase atheism is true). The context of these points is therefore vital, otherwise there isnio case for atheists to defend here. You would have a point if arguments for atheism started to make contradictory claims.
"I still say a church steeple with a lightning rod on top shows a lack of confidence"...Doug McLeod.