The suppression of the Bacchanalia in Rome 186 BCE was the first major religious persecution in Europe. The essay provides a new analysis, referring to the political theory of Eric Voegelin. It shows that the suppression was a reaction of the Roman commonwealth to a cult which challenged the meaning of political existence within the republic. Ultimately, the Bacchanalian affair is a collision of two types of religiosity, the political religiosity of the public cult and the orgiastic and apolitical religiosity of the Bacchic underground. Both types are based on particular religious experiences, the experience of gods preserving and fostering the political community and the experience of a god promoting the fulfillment of bodily desires. As the essay shows at the example of Euripides’ Bacchae, the worship of Bacchus-Dionysus had always represented the apolitical dimension of human existence; already in the ancient myths the “alien god” figures as the opponent of rulers and politicians. Finally, this reconsideration of the Bacchanalia helps to understand why the early Christians were likened to the Bacchants.