The Supernatural

Why is it sooo easy for non-Christians to understand the Supernatural power and glory of Christ? But Christians have such a hard time wrapping their heads around it. God is so great in power and glory, why wouldn't he be able to do all he said and more in our lives now. I wish their was a way for Christians to at least be able to open their minds to ALL God has to offer and not just some of it, they don't have to receive it I just wish they would be open to it.