Videos on social media showed protesters interrupting Sunday Masses while holding signs supporting abortion.
"Profanity, violence, abusive inscriptions, and the disturbance of services and profanations that have been committed in recent days -- although they may help some people to defuse their emotions -- are not the right way to act in a democratic state," the archbishop of Poznań said.
"I express my sadness that in many churches today believers have been prevented from praying and that the right to profess their faith has been forcibly taken away."
Gądecki's own cathedral was among the churches targeted by protesters.
The archbishop emphasized that it was not the Church that decides whether laws comply with Poland's constitution.
"For her part, the Church cannot cease to defend life, nor can she fail to proclaim that every human being must be protected from conception until natural death. On this point, the Church, as Pope Francis often says, cannot compromise, because it would be guilty of the culture of rejection that is so widespread today, always affecting the most needy and vulnerable," he said.