So you are arguing that polar opposites have absolutely no similar characteristics?
Perhaps you can provide some sort of example of this since I have never heard of this before
(Ever wondered why it was kind of strange that communism and totalitarian regimes are ideologically polarized yet remarkably similar in practical application?)
atheism requires nothing. Except that living is life.
There is no practice or requirements.
You are human, you live like a human.
therefore there is nothing significant.