Patriarch Kirill was enthroned as the 16th leader of the Russian Orthodox Church exactly two years ago.
The Patriarch conducted a liturgy at the Christ the Savior Cathedral on Tuesday morning.
The present period differs from the past by "the presence of some apocalyptic tension because the power of the force of sin over mankind is stronger today than ever," Patriarch Kirill said.
The Russian Orthodox Church could "not stay indifferent to this multiplication of evil," he said.
"Some politicians are asking us with puzzlement why the church is interfering in spheres that do not fall under its jurisdiction. This is the response to the Church's work to help reduce divorce and abortion rates, to teach people to dress decently," he said.
However, this criticism will not force the church to change its policies, Patriarch Kirill said.
"We will be scolded in the future. We are ready for it. The Church has no words other than: 'Repent, for the kingdom of God is at hand,'" he said.