The character is Lucius Scarlett on the FEI. Both William Norrel and Augusta Meneldur were unable to invite him for a sermon. William got this message on the 'invite a priest' screen. The 'invite' list was just blank even though Lucius was there with him. Lucius is the founder of the faith.
Also, 'worshiping' is mis-spelled.
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Out-of-Character from William Norrel (19 hours, 42 minutes ago)
You are a pagan. Since you are not a member of any religious order that was nobly enlightened or founded, no matter what spirits or deities you currently are worshipping, they apparently all took their origins from the lowly peasants. Not something very honourable to be even mentioned about.
Fortunate for you, during your stay in Taop, you encounter the opportunity to learn more about some of those "higher ideas". You can invite any priests who have already built their own reputations and happen to be in this region the same moment, to come to your place and deliver a private sermon, which may help you to understand some of the fundamental doctrines of their faiths and perhaps even a chance to convert with the blessings from them. That is, if they are willing to extract themselves temporarily from their vast followers specially for you alone.
Invite...
It will require you an hour of time to send out this invitation.