There are two posters here that have mentioned sectarianism and both appear to live in Scotland. I have never had any experience of this and my reactions on things therefore aren't tainted by it. Perhaps theirs are.
The thread title asks: "Is sectarianism a factor in the McCann case?" so you appear to be under the misapprehension that only two posters are posting on topic which is entirely in error.
Your posts have indicated to me traits in your opinions of which you appear to be in ignorance but which leap out of the page to me.
In one of your earlier posts regarding Kate and Gerry's religion you suggested - and I paraphrase here - that the remedy for MSM reference to their 'devout' Catholicism might be that rather than taking part in religious ceremonies for Madeleine publicly in the street they could better take their devotions into the privacy of a church service.
In my opinion the gatherings held in Madeleine's home town were a spin off and continuation from vigils held by friends and neighbours and in the early days as a vehicle to keep Madeleine alive in public consciousness when there was no official investigation happening in her case.
It has absolutely nothing to do with Kate and Gerry's religion or where and how they chose to worship.
In Rothley this year on the eleventh anniversary of Madeleine's disappearance "Prayers were led by parish vicar the Rev. Rob Gladstone"
https://www.dailystar.co.uk/news/latest-news/700374/madeleine-mccann-anniversary-news-missing-vigil-parents-gerry-kate-rothley-leicestershire who is vicar of Rothley Parish Church a vibrant Anglican Evangelical community in the village
http://www.rothleychurch.org.uk/about-us/about-our-church/ and is now an opportunity to take advantage to publicise other missing people;
Snip"Gerry, 49, dressed casually in jeans and grey sweater, joined locals placing name tags of symbolic missing and lost people on a vine tree of hope temporarily placed at the heart of the village.
Among 28 selected names read out as they were attached to the branches were Claudia Lawrence and April Jones, and Madeleine McCann."
https://www.dailystar.co.uk/news/latest-news/700374/madeleine-mccann-anniversary-news-missing-vigil-parents-gerry-kate-rothley-leicestershireYou also appear in this post to make assumptions about the people of Scotland as a whole based on the anecdotal evidence of two which is hardly scientific especially for the resident? (I presume) of a state with inbuilt bias against Catholics at its root as typified by the Act of Settlement which restricts the monarchy to protestants.
I have identified sectarian bias against the McCann family in very many insidious ways not because I am a Scot and the subject of a British State with religious bias at the heart of it (ie the head of state by statute
must be protestant), but because I am capable of analysing what I read.