The Pope switched to Gaia worship. He joined their religion. No conflict if the religion is theirs.
Besides, the Vatican is a state. With a throne and crown.
When JFK was campaigning, Democrats feared that Protestants would not vote for a Catholic because they did not want to put the Vatican in charge of the US. In response to that fear, JFK said “I do not speak for the Catholic Church on issues of public policy, and no one in that Church speaks for me”. Americans believed him, elected him, and such fears were mostly put to rest.
But if statements like this from the Vatican continue, then Catholic presidential nominees will find themselves in the uncomfortable position of disavowing the Pope’s blatant attempts to use the Catholicism of some of our elected officials to control certain US policies - especially those that have a very dubious scriptural basis, such as global warming.