A lot of it isn't simple asking of questions. For whatever reason, there's a large portion of atheists who want to destroy the faith of Christians for whatever reason they have for it. Why do they care so much about what other people believe? If you don't believe in God, then go on your way. Why try to take my faith away from me?
Oh, I can VERY easily answer this.
It's because religion can cause harm.
Some people are abused because of it, whether it be through priests (supposedly "holy men of God") or their own families.
Women were seen as inferior because of the Bible, slavery was perpetuated and given Bible verses in support of it. And there are many.
People, even a few on this forum, are deathly terrified of hell. It sickens me to see people here that afraid. And hell is such a barbaric concept that it seems only evil people would think about perpetuating such a thing.
Some things in the Bible are completely awful, like God commanding Genocide, slaughter but keeping the virgins for themselves, beating a slave to death being okay as long as they do t die right away, and so many many other things.
The doctrine of original sin can cause some to have incredibly low self-esteem.
It can cause people to make decisions that turn out awfully because they think it's what God is telling them.
Questioning can bring ridicule or hostility from strong believers and cause the doubters to feel shame, guilt-tripped, depressed, and threatened. As if some are trying to scare them into believing.
THAT is why nonbelievers and questioners care. Because it can be heavily damaging, threatening, awful, abusive, and borderline evil. Are there good points to religion? Sure, with the right people, but points like the above are terrible things that people need to know about and shouldn't be scared from questioning or feel shame, guilt, and afraid of their own thoughts as a result.