@janbb – I think that @RedDeerGuy1 posed the question differently.
The pope is acting as god’s agent (in the litigation sense, the pope is the designated legal representative) designated by the Catholic Church to act and speak for God. The Catholic Church has a huge hierarchy of people (Bishops, cardinals, etc.) and 2000 years of history (and the ecclesiastical courts) that have affirmed that the pope is the manifestation of god on earth.
The primacy of the Roman bishop is largely derived from his role as the supposed apostolic successor to Saint Peter, to whom Jesus is said to have given the Keys of Heaven and the powers of “binding and loosing”, naming him as the “rock” upon which the church would be built.
So if you buy the idea that the Catholic Church and the pope are in fact the duly authorized representatives of god, then logically and legally, the pope could be held liable (or at least subpoenaed) for acts of god.
The question is far less about whether god exists or not, and far more about who represents god on earth.