There was no capitalization at all in the 2 Century. If you read the letter, you will know that St. Ignatius calls Catholics to obey their bishop and stay away from heretics that don't recognize the Body and Blood of Jesus in the Holy Eucharist. (Proof).
St Ignatius who?
Some guy who wrote an opinion piece about Christianity?
Imagine that. Someone forgot to include something as important as that in Scripture so Catholics are left to resorting to opinion pieces.