Do I believe Atheists are going to hell?

[SteveII]

But if a place had to be created that was separate from God as a result of our sins in light of God's essential (as in could not have been any other way) perfect holiness/justice, then who is responsible for such a place existing?

Well, *I* didn't create such a place.

And what good is "holiness/justice" if it requires existing in isolation from anything that might sully it?

I would say that God is the perfection of each of his attributes. Arguments can be made that holiness is better than wicked. Justice is better than injustice. Concepts of perfectly holy and perfectly just separately and together carry entailments such as can't abide the presence of sin nor the can allow it to go unaddressed. 

Please remember that the main doctrines of Christianity have been discussed and written about by learned people for 2 millennium. Billions of hours of thought have gone into these concepts. Christianity's main problem today is the inability of the typical believer to defend doctrine against a more organized and sophisticated objector. However, that does not mean the there are not very good answers to the objections.