Very much agree with this.
Our club would have drawn it's support and players simply from the Greater Glasgow population, which would at that time have been, and still is, overwhelmingly protestant. Therefore, it would be inevitable that the vast majority of our fans and players would be protestant, if not almost all.
Of course, when a sectarian club was then formed in our city, it may then have nudged us more in the direction of being a "protestant club", in direct response and as a differentiator to their club being formed as being overtly for Roman Catholics only.
In any event, the formation of sectarian clubs in Glasgow, Edinburgh and Dundee was the beginning of sectarianism in Scottish football. The causes start there.
As for today, your excellent article, Mark, shows that any claims of disadvantage coming from the Roman Catholic community in Scotland are now nothing more than a thinly veiled smoke screen behind which those wailing seek to gain further advantage for their community. There is, as your article and this debate clearly shows, absolutely no evidence of Irish descendant Roman Catholics having suffered any significant disadvantage in Scotland now or in the past. On the contrary, they have been welcomed and have enjoyed significant advances through their time spent in a mainly protestant country with a strong focus on education and work as the means of advancement.