A couple of billion out of 90 billion is a few.
How do you know the sand of the sea equals a couple of billion? You are the one that keeps saying billions. I assume that is plural for 1 billion, thus 2 billion.
Sin is disobedience to God. Death is rejecting Christ. Is it a sin to follow your pastor? Is it a sin to follow any one?
Is it a sin to think about sin?
I never heard anything so ridiculous in my life. Where do you get this 90 billion from? Where do you get those 2 billion from? It is all a figment of your imagination. 2 billion wicked mortals overrunning your supposed perfect blissful millennium is a debacle. It seems like you make your theology up as you go.