I have a personal relationship with God. He is my salvation. That isn’t about me. It’s about Him. Amazing Grace is about the amazing grace of God, not the amazing grace of the person singing the song. God saved me from myself, and it is not self-centered to sing His praises for bestowing His grace upon me.
The song is, after all, “Amazing Grace”, not “How Wonderful I Am”, or the favorite of CCM: “God Loves You Just the Way You Are”...
The problem with CCM is that much of it ignores the ideas of sin, the need to repent, and that we need to be made a “new creation” in Christ.
I can not understand why any one dislikes that song. It is beautiful. I have been singing it for decades. It is one of the most loved hymns of all time. I love to listen to bagpipes playing it.