It is much broader than just eating meat. It explicitly includes observance of holy days (and, by inference, the rituals that made those holy days unique).
You need to repent of your narrow-minded, hypocritical judgment of your Catholic brothers.
No, it only uses that as an example. And there is no inference of any rituals.
The true church never used or co-opted any pagan rituals such as making a mark of Shiva on the forehead.
And I am a Christian, not a catholic. So no more than they consider me a sister in their faith, so I consider them brothers in mine.