Oh yes, I remember this. They used to play it to us on a record with other songs -- each dealing with a separate sacrament. This is the only song -- played in a march tempo, to underscore the militaristic theme -- that I remember from the album. Even at the age of 9 or so, I thought it a bit catchy but also a bit cheesy. I didn't know the word "triumphalist" at the time, but I think it applies. So does "moral vanity".
Now, this is not to say that I have a quarrel with any of the ideas in the song. I do understand and accept the idea of the Church militant. I do believe it's my duty to be Catholic unambiguously and without shame. Why then did I recoil from the song? I think it must be its exhortatory, collectivist cast. The mode of presentation was propagandistic, groupthink -- an appeal to childish hunger to be included in the happening group. I didn't and do not think the Christian call to conversion and sacrifice should be presented as a facile matter of falling in line, yet this is the subtext of all music in march time, working through rhythm to urge our bodies through emotion and enthusiasm. This is not how the Church should preach.
Interesting post, I was beginning to think my sister imagined the whole thing.