Zeig Dich

An anti-theistic call. "If God existed, he would be evil" because he does not show himself, being that so many evil things happen, including many which happens in His name or by His followers. We need help and He does not show up to help.

Between many other things mentioned are the pedophilia cases in the Church ("Aus Versehen sich An Kindern vergehen" / "unintentionally abuse childre"), the prohibition of the contraceptives ("Verhütung verboten" / "proteccion forbidden") and overpopulation ("Verbreiten und vermehren Im Namen des Herren" / "Expand and multiply in the Name of the Lord").

https://www.rammsteinworld.com/en/lyrics/translations/rammstein#zeig-dich

I like EduardoSilva's take, but I also see room for more interpretations.

This could be about corruption and hypocrisy in the Catholic Church, if not also other gentile denominations of Christianity.

Note the Latin word "extraspection". Assuming this is a cognate, it implies, in the context of the Deutsch lyrics, that the Church in question is looking for and condemning [perceived] evil without while ignoring any within. Basically, it takes "Halleluja" and expands its scope.

Perhaps the narrator is imploring God to appear and dispel the doubt and confusion, to show what is truly right and wrong, to show who is right and wrong, to reveal the lies and crimes of the religious authorities. (Compare and contrast the final lines of "Sacrificed Sons" by Dream Theater.)

Perhaps the narrator is telling the Church to show itself: to lay bare all its iniquity and confess its sins. ("Show yourself, you coward!")

In partial agreement with EduardoSilva, this could be a Christian questioning or losing its faith, both due to the corruption of the Church (especially its officials' failure to hold themselves to at least the same standards as everyone else) and to perceived broken promises ("Kein Engel in der Not / In distress, no angel", "Kein Gott zeigt sich / No god shows itself").