Getting back to the original topic,
Socially, religiosity is a way of problematizing or at least lending some much-needed complexity to the privileging of certain ways of looking at reality that when their privilege is unquestioned impose their own, often oppressive, absolute intellectual laws just as much as dictatorial religious bodies in previous eras did (and still do in many places).
I assume this is referring to science?
Here are my reasons
1. Revelation- the truth is revealed to you, and when you try and say this, you are labelled religious.
2. Faith- you have faith in God, and so are labelled religious
3. Meaning in Life- no explanation needed
4. The Establishment of Identity- to set yourself against others
5. To Be Comforted- to be confident against the trials of the world
6. To Be Loved- to have a personal relationship with a higher being
7. Vertical Integration (With One's Ancestors and Descendants)- a way of finding community
8. Horizontal Integration (With One's Community)- a more immediate way of finding community