Almost certainly not from their religion, which was nominally Lutheran. Luther, if you'll remember, sided with the German princes against the peasants.
Quoting the great man himself.
First they have sworn to their true and gracious rulers to be submissive and obedient, in accord with God's command (Matt. xxii. 21), "Render therefore unto Caesar the things which are Caesar's," and (Rom. xiii. 1), "Let every soul be subject unto the higher powers." But since they have deliberately an sacrilegiously abandoned their obedience, and in addition have dared to oppose their lords, they have thereby forfeited body an soul, as perfidious, perjured, lying, disobedient wretches and scoundrels are wont to do. Wherefore St. Paul judges them, saying (Rom. xiii. 2.), "And they that resist shall receive to themselves damnation." The peasants will incur this sentence, sooner or later; for God wills that fidelity and allegiance shall be sacredly kept.
Ancient Greece?