That does seem to be what certain books of the New Testament claim. We read:

• “25 Consequently, he is able for all time to save those who approach God through him, since he always lives to make intercession for them. (Hebrews 7:25)”

• “34 Who is to condemn? It is Christ who died, or rather, who was raised, who is also at the right hand of God, who also intercedes for us. (Romans 8:34)”

The question is why does Jesus need to be in heaven perpetually interceding on our behalf if the cross was Jesus taking the death penalty we deserved and thereby reconciling us to God? This is an interesting question, and so perhaps substitutionary atonement wasn’t originally the main thrust of cross theology?

Paul said he had determined to know nothing among us but Christ and him crucified, but seems to reach a higher understanding by negating its importance:

• “17 If Christ has not been raised, your faith is futile, and you are still in your sins. (1 Cor 15:17)”