Analysis of information sources in references of the Wikipedia article "Political satire" in English language version.
The fact that the gods could be brought down to a human or 'far too human' level is certainly rooted in the very nature of Greek religion, and there is no doubt that this attitude contributed to the gradual undermining of the old belief in the gods. [...] To tell immoral and scandalous stories about the gods did not offend average religious feeling; it troubled only advanced spirits like Xenophanes and Pintar [...] and it is clear that people no longer believed either in the story or in Zeus. Satire and derision progressively attacked even the fundamental and most sacred facts of faith, above all faith in the gods' power, and it was from this that doubt began to grow.
The power of the gods, whose dignity and stringth were impressively reflected in most of the tragedies, however different the religious attitudes of the tragic poets were, this same power was on the same festival days belittled and questioned by the comic poets who made fun of the gods and represented traditional and sacred forms in a starling manner.