Believe me I don't have all the answers, especially to this. But aren't you asking about people who have not been exposed to or turn away from God. It would appear that the knowledge of God is born in us. And I mean the knowledge that He is.
God gave us free will. We could have been created as robots, where we stopped at 11:45 every day and worshipped. But He instead gave us a choice. Isn't part of what we are called to do as Christians is to introduce others to it?
I have gunsmithed and built custom rifles since 1986. I have used them all. Sounds like to me you need Brownells Nitre Blue. One of the nice things about Brownells is their tech support.