According to the RCC (by far the largest Christian sect, with claims of a membership of 1.2 billion) anyone with faith can perform an exorcism, but there is also a form of exorcism that can only be carried out by an ordained RC priest, that's called a solemn exorcism.
That would mean there are - in the RCC's view - 1.2 billion people who can perform an exorcism and it's around (if my recollection is correct) 400,000 priests that could perform a solemn exorcism. I think 1.2 billion is a "huge number" of people.