of a/the... persuasion
of a/an/the (something) persuasion
Having the characteristics of a certain type or thing mentioned. Her parents are of a more conservative persuasion, so they don't really approve of our relationship. When it came to light that she had several friends of the communist persuasion, she was blacklisted from the industry immediately.
of the persuasion that
Having the firm belief that something is the case. I actually know someone who's of the persuasion that the Earth is flat. They're pretty normal other than that bizarre conviction.
of the persuasion (that)
holding a belief that something is true or is in existence. Anne is of the persuasion that supports that candidate for mayor. The paranoid person was of the persuasion that aliens lived among us.