Insulting God In Salvation
The Bible says that Christ and His death on the cross is the power of God unto salvation (Rom 1:16 and 1 Cor. 1:18). Therefore, Christ's death on the cross is sufficient for our salvation. You don't have to add anything to it in order to be saved. God's power does not need our help, assistance, or aid. Christ's death on the cross alone is enough --- God's power alone is enough.
Here's how we insult God in this matter --- When we add our good works, our sacrifices, and what have you to Christ's death on the cross for our salvation, we are essentially saying to God: "God, Your power is not enough to save a sinner like me. It needs assistance on my part."
Here's how to glorify God in the same --- Acknowledge Christ's death on the cross as God's power unto salvation by putting your entire trust in it. It's essentially saying: "God, I am confident that Your power is enough for my salvation. I trust in it alone."