Mr. Holdsworth, the provost of St. Mary’s Cathedral in Glasgow, belongs to the Scottish Episcopal Church, a separate province of the Anglican Communion that voted in June to let its priests solemnize same-sex marriages.

In his campaign to expand on that change, Mr. Holdsworth wrote in a blog post on Thursday that believers could “pray in the privacy of their hearts (or in public if they dare) for the Lord to bless Prince George with a love, when he grows up, of a fine young gentleman.” Prince George is the elder child of Prince William and the former Catherine Middleton, now called the Duke and Duchess of Cambridge.

“A royal wedding might sort things out remarkably easily, through we might have to wait 25 years for that to happen,” Mr. Holdsworth wrote.