The Imperial Church is the official religious establishment of The Empire. Like its counterpart in the normal Universe, the Imperial Church bases its beliefs on the following of the Holy Light, however it places loyalty to the Emperor as first and foremost of all. Due to this second rate of worship, paladins of the Empire are not as powerful in the Holy Light as they would be if they devoted themselves firmly to the beliefs of the Light.
In response to this heretical worship, another secret religious organization has been created, worshiping underground, called the True Light. The Emperor has outlawed worship of the True Light Church, and anyone found practicing it would be immediately put on trial for treason and heresy against the Church.