- 1 Jn 5:16-17 If any one sees his brother committing what is not a mortal sin, he will ask, and God will give him life for those whose sin is not mortal. There is sin which is mortal; I do not say that one is to pray for that. 17 All wrongdoing is sin, but there is sin which is not mortal.
Jesus even said in response to Pilate, "he who delivered me to you has the greater sin" (Jn 19:11), which can only mean that Pilate's act of condemning Jesus to death was a lesser sin than Judas' act of betraying the Christ. That one sin would be greater to him than another one means that they are not all equal in his eyes.
I think plain common sense provides the best argument against this notion that all sin is the same to God, but, as I hope you now see, Scripture provides some valid arguments as well.