We have been saved. And our salvation is not of this earth. For God so loved the world that He sent His one and only son - that whosoever believes in Him, shall not perish, but have eternal life.

We will never manage to achieve peace on earth. And putting away “superstitious beliefs” will just make your life very short. You can still work for peace and be a Christian, as well. I don’t see why it needs to be one or the other.