The "substitutionism mindset" ruled the church when the covenant of Jesus Christ was no longer taught. Substitutionism is a doctrine of convenience. It feels good to have Jesus take our place and to think that Jesus gave us His place… but it isn’t God.
On the surface, there doesn’t appear to be anything wrong with the idea of Jesus being our substitute. But the undertow of the flesh will pull you down into troubling waters. Your faith is drowning and you need someone to throw you a life line.