And it was their belief and not his power that healed them.
Pat Robertson has never claimed to have power. He has the spiritual gift of healing.
(All Christians are given at least one Spiritual Gift when they accept Jesus as their Lord and Savior.)
Those with the spiritual gift of healing sometime receive what is called Words of Knowledge...a revelation from the Holy Spirit.
The person for who it intended has to receive and believe the Word of Knowledge through Faith to be healed.
Pat Robertson is sort of a 'spritual conduit' for the Holy Spirit.