Theism is literally childish

[Brian37]

It's not so much that theists don't feel so responsible for their actions in that they are giving up responsibility for their actions to someone else.

They are partially outsourcing their decision making process by deliberately going to a service every Sunday to be preached to. And it's not just an hour or so of praise about how wonderful their god is, but preaching about what people should value (e.g. family values), about how to live their lives, about what people should hate (e.g. homosexuality, pornography, masturbation etc)

All people partially outsource their decision making process by seeking advice.

Again, if atheists are all figuring out these gray issues for themselves, why do they seem to mostly have the same beliefs on any given issue?

Yes, there are some atheists here who are against abortion. Similarly, their are some Christian churches that accept openly LGBT members.

What's the difference? Why is it acceptable to partially outsource to atheist youtube videos, but not to a church?

Nobody here is claiming all atheists agree 100% of the time. We most certainly are just as diverse in our opinions as theists, I don't think any atheist here is denying that.

But what does that have to do with god claims or old mythology?

There are atheists who are against abortion? Yea and? 

There are also atheists who worship firearms on par of right wing theists too.

There are atheists who think Che who lead to Castro's Cuba was a good thing.

There are atheists who like Ayn Rand like Catholic Paul Ryan does. 

So?

I don't agree with anyone who holds those positions, regardless if they believe or not. 

Bringing this up like you did in this post is not an argument for your position. Yea we don't always agree so? That only proves we don't always agree, that is not a an argument for your club or God.