For example, you often hear people say "Many leading philosophers are believers, so it can't be that unreasonable, can it?" William Hawthorne earlier made this sort of move (correct me if I am wrong, William).
Another example I heard from philosopher Gary Habermas (paraphrasing) "The vast majority of Biblical scholars agree that the historical evidence for the crucifixion of Jesus is strong" (he then proceeds to argue that what they agree on then provides ample evidence that Jesus was resurrected. I am reading his "The Case For The Resurrection of Jesus" at the moment.
My view is these arguments from authority are very weak. But at this point I merely invite comments...
Go here for examples of fallacious appeals to authority. Are the above fallacious appeals?