Automatically there will be peace on earth. This is an erroneous notion. The heart must change. Greed and selfishness must perish. Then alone there will be peace in the world.
People merely talk of religion.
They are not interested in practicing it, in living it. If Christians lived by the Sermon On The Mount, if the Buddhists followed the Noble Eightfold Path, if the Muslims truly followed the teachings of the Prophet, and the Hindus shaped their life in accordance with the teachings of the Lord, of saints and sages, there will be peace everywhere. Peace, to be lasting and constructive, must be achieved through God. There can be no peace without the Lord or God. God is Peace.