What he said is all men are created equal by God which is the same thing basically that the Declaration of Independence of the United States says, "that all men are created equal".
People don't like it when someone says Americans aren't better than people from other countries but are humans just like them.
What Putin said in context: "There are big countries and small countries, rich and poor, those with long democratic traditions and those still finding their way to democracy. Their policies differ, too. We are all different, but when we ask for the Lord’s blessings, we must not forget that God created us equal."
In context Putin is saying that democratic republics like the USA are not better than autocratic tyrannies like Russia and Syria.