I'm not sure the we're all sinners statement does anything for your argument. And also the ferocity in which you believe does not translate into others following suit.
You believe while others do not, saying we are all sinners in the eyes of the lord and saying it as fact rings hollow with some one who disagrees with you.
So you can’t reply because the subject of the debate is “What specific evidence would people require to believe in God's existence?” And instead of evidence you want to preach?
All I’m saying is putting forth guidelines for some specific evidence for God’s existence is all I think is required here. Telling people that your God is going to punish them for not believing as you do is not evidence.