Many atheists agree with the teachings of Christ regarding the gospel of the Kingdom of God. They embrace these teachings. They derive great satisfaction from putting these into practice, while Christians continue to make derogatory statements about these teachings of Christ.
What is going to be even stranger [foretold in the bible], that on the day of judgment Jesus Christ will welcome some of these same professed atheists into the Kingdom of God, and some of those professing 'Lord Lord' will be cast out.
Strange. God works in mysterious ways.