Christians are not sinless . Only one sin is unforgivable . Assurance is faith in God's work . Assurance is faith in God's word . From this perspective, assurance of salvation is simply taking God at his word.
Assurance is incomplete without evidence .
Although our salvation is not dependent on our performance, salvation is a work of God which does produce changes in a person's life. Heidelberg Catechism 1563 1. The idea of God's anger being vented on Jesus is unworthy of God. Westminster Confession of Faith 1647 4. The Bible does not teach that unbaptized persons can be saved.