Of course the so-called argument from authority doesn’t amount to an argument or any kind of proof. Everyone could be wrong, after all. But if we didn’t give some weight to authority you’d have to dismiss everything your teacher told you in school which you didn’t observe yourself. So asking what the experts say is of some value.
So where do the ‘authorities’ who study the questions of God’s existence, the nature of the world beyond the senses, and what morality is like stand? When the greatest minds who have devoted themselves to these questions get together and mull over all the arguments that history has produced, what do they conclude?