If you dont want divorce then fight for it, but there is no magic pill. You have to want it and take action to fix it. You owe to your child if nothing else.
Its blows my mind that your parents are driving this.
But it doubly blows my mind you don't know why they want it? That is bizarre. Do you really not know?
Could it have anything to do with their grandchild and both of you suffering from some kind of addiction? Maybe your parents think that your spouse is not healthy for you. You are an adult, have a marriage and a child but the fact you act like you have no say so about your marriage/divorce and have no clue why your parents want this so much makes me wonder about this addiction and the hold it has on you.
You both need to get that monkey off your back