One World Religion is the idea of blasphemous worship to Lucifer, in gross ignorance of the Holy Bible. Humankind elevates themselves to the level of God (or attempts to), the ultimate move to mimic Luciferian rebellion in which Satan coveted the Throne of God.
Implementation of One World Religion is carried out by the Catholic Church. It is likely that the Pope will attempt to claim that he is a god, uniting Catholicism and what will be left of the Muslim world in the movement. It is unknown if another will be introduced near that time, possibly Maitreya as a False Prophet.