God's sovereignty is never exercised in condemning people who ought to be saved, but rather it has resulted in the salvation of people who ought to be lost.
If Jesus is in our human form, He can be wherever we are. Through us, the Holy Spirit can respond to the needs of others.
I guess the same could be said about a Christian. If they really wanted to stop sinning, they would. All they have to do is stop. Trust me, it's not that easy. There is always the possibility of a relapse.
He's calling us to remember our past and those times we exercised our free will and did something that we knew wasn't right that ended badly. We knowingly took that first step and the slope immediately got slippery and down we went.
After thoroughly vetting him, you make the decision it's safe to accept his friend request. Besides, he looks like a friend you could use when the going gets tough. Might make a good character witness.
Wait! What? You mean that somebody like me who has only committed some relatively minor sins is treated as an equal with a murderer, a rapist, or even a child molester?