Sand wrote:
What makes you think "Christianity" is not a generalization?
It is a generalization, but it is more specific than just saying "religion." If the argument uses the term religious then the argument should draw examples from many religions not just one. If the examples in an argument are all from just one religion the term religious is not specific enough to really describe what the argument is actually about.
There are many levels of specificity, take Class, Order, Family, Genus, and Species for example. If I made an argument about a whole Family of living things based on one Genus or one Species, I would be generalizing my conclusions too far. However, if the the argument began and ended at the same level of specificity, the argument might be credible and make more sense.