It's a stand against the cases for faith and religion because those cases aren't based in reality or reason.
Claim - God created the earth and mankind and has a plan for everything.
Counter - There's a mountain of evidence that the universe is a hostile place where evolution and natural selection only allow for life to fight it's way forward at great cost.
Claim - What about morality, how do we have objective morality apart from God who is good?
Counter - In the Old Testament, used by Judaism, Christianity and Islam, God orders and commits genocide, rape, and slavery, things we know to be objectively wrong. A good god wouldn't order slavery and rape, then drown the earth in a manner similar to Hitler gassing the Jews.
Claim - Give your life over to Jesus and you'll see a real change. God answers prayers and wants a personal relationship with us as is claimed repeatedly in the bible.
Counter - Most prayers go unanswered, or if they are answered, it's as a result of the other things you did besides praying. When you look at severe, honest, desperate, impossible prayers that go unanswered, it makes it less likely that God was the reason the resume you sent out and interview you went on turned into a job. When you ask Jesus for advice in prayer, you never hear anything that you didn't already know, or a voice that isn't your own.
Claim - My religion is real because my "holy book" was inspired by God. I know this because I know it and because it's written in the book itself.
Counter - Something that claims to be true can't support itself as being true or God-Inspired. There has to be outside evidence. The books should reflect reality in such a way as to be impossible to challenge. The "truth" should be as visible as "the earth is round" and "a force we call gravity draws objects together" and "the speed of light is really fast".
Claim - But God acts in my life every day. He talks to me and we have a personal relationship. He really wants me to save you!
Counter - It should be easy then right? Just have God tell you something about me that only I would know, and with enough specifics that he'll know I'll be convinced, and, I'll start down the path of exploring faith with you. Sound good?
Claim - Oh... well, God can't be challenged or tested... sometimes he answers prayers with "yes" or "maybe" or "wait" or "no" and he allows bad things in your life for the greater good and that's why Christians don't see any statistical difference in any area that reflects that any prayers make any difference in any aspects of their lives... BUT GOD IS REAL!
Counter - In the Bible in multiple places, God is tested and allows himself to be tested. God appears to all the prophets and Paul. Jesus lets Thomas touch his wounds. Elijah literally has a "test my god" challenge against Baal in the Old Testament. God promises to answer prayer if Christians agree in prayer. Surely there would be SOME statistical difference in SOME testable area if God was ACTING in the natural world.
Over and over, these claims are made in circular fashion, and never defeat the counters.
It is important to live our lives believing the most "true" way we can, so that we're able to empathize with others and do as much good and little damage as possible. If you understand that other people's lives are ALL THEY HAVE and you don't know their circumstances, it's easier to show respect and value towards their time and life.