From a reader:
I was taught to cross myself when passing by a Roman Catholic Church out of reverence for the Real Presence in the Eucharist that is present in that house of God. I live outside Washington D.C. and I see various Orthodox Churches, including a Ukrainian Orthodox, Indian Orthodox, Armenian (Iglesia Getsemani AIC), Russian Orthodox, Eastern Orthodox, Antiochian Orthodox, Greek Orthodox, et. al.
Given that the Vatican recognizes other churches as having the Eucharist, how do I know which churches, besides Roman Catholic ones, I should show reverence for when I pass by? Or should I keep it simple and only cross myself by Roman Catholic ones?
I think it is a good idea to make the Sign of the Cross, and you can accompany the pious gesture with any one of a number of short phrases which can gain partial indulgences.
If you know you are going in front of a Church where you are certain the Blessed Sacrament, valid Eucharist, is being reserved, I cannot see the harm in blessing yourself.
But it is up to you. It isn’t a sin not to make the Sign of the Cross when going in front of a Church unless, perhaps, you are purposely ignoring the Lord whom you know to be present.