I don't think she left her husband for Vince Gill....this is what she said:
I didn't get a divorce because "I had a great marriage and then along came Vince Gill". Gary and I had a rocky road from day one. I think what was so hard—and this is (what) one of our counselors said—sometimes an innocent party can come into a situation, and they're like a big spotlight. What they do is reveal, by comparison, the painful dynamics that are already in existence.
This is all squishy and nice, because everyone deserves to be happy, right? I don't see anywhere in the Bible it tells someone to get divorced for any reason, except adultery. Most marriages need to be worked on. I don't know either Amy Grant or Gary Chapman, but I do know that marriage is not always easy. And our goal is not to be happy in this life, but to live for God. When you are a popular star, and you choose to live the way of the world, (the divorce rate of Christians being the same as the world - 50% of all marriages) what is the difference between Christians and the world? Not much! And I wonder how many people in marriages that could have had a chance and been worked on, might have felt Amy Grant leaving her husband was justification for leaving their spouse? I guess God knows!
PS I am not saying anyone, male or female should live in a physically abusive marriage. But, should divorce be on the table? Not so much. God says with regard to teachers, that they will be judged by a stricter standard, (James 3:1 "Not many of you should become teachers, my fellow believers, because you know that we who teach will be judged more strictly." NIV)
Well, someone who is influencing people towards Christ, and yes some of her albums had a lot of teaching on them, God says he will judge them more strictly, and I don't believe that is just about doctrine. Someone in authority or teaching, is going to also be judged on their lifestyle.