What is the appeal of attacking Christianity?

[Phatose]

Existence is it's own purpose.

[Ser Clegane]

Existence is it's own purpose.

Seemingly this is not the case for a lot of people - thus the attraction of religion. "Knowing" that one is part of a "greater purpose/plan" (even if the details are not known) can certainly be soothing.

Note that it is not my intention to ridicule religion - as I personally would rather tend towards agnosticism (although I don't have the feeling that the term precisely describes my feelings with regard to God and religion)

However, I noticed that a lot of people who went from non-religeous to religeous specifically point out the satisfaction gained from "knowing" that their life has a purpose.