OK, thanks for the clarification.
My answer is yes, it does matter whether or not we turn our back on God or not. And you are correct, whatever you or I do or the US does is part of God's plan.
Knowing God has a plan for all of us doesn't mean we can just sit back and relax.
I think instead of just sitting back and relaxing, (unless, of course, that is what God has planned for you), we just continue on doing what we think we should.