Here is a list of blog posts dealing with the foundations of medical substitutionary atonement in Scripture, and supports from church history which always include analyses of Scripture. For a list of blog posts about the implications of your understanding of the atonement, see Atonement Implications. For practical training on how to share Jesus, see Sharing Jesus.
The Suffering Servant of Isaiah 53
Temple Sacrifices and a Bloodthirsty God?
Circumcision as Atonement
Athanasius, the Trinity, and the Nicene Creed
‘My God, My God, Why Have You Forsaken Me?’
Human Being, Human Becoming:
Exploring Human Nature and Human Personhood