The implication of the post, as I perceived it (have a look at its first paragraph) was "you guys shouldn't be so confident in your dismissal-of-religion ('atheism'); after all, you (perhaps rightly) are willing to entertain the ideas of Tegmark!

The OP does not make mention of the term 'religion'. Part of the confusion seems to stem from the conflation of theism and religion.

Theism is a philosophical belief about the nature of reality. The truthfulness of this belief as a map of reality is not somehow dependent or connected in belief space to magic rituals, prayers, voodo dolls or the memes of organized religion, even if they historically co-occur.