1) Your comments are not correct.  Prior to Vatican II---ALL the religious training of Catholics was nothing BUT the Baltimore Catechism.  No training in Sacred Scriptures, Liturgy was nothing but a mumbling  priest rattling off a liturgy to himself---with his back to the people, lay people were treated as beggars coming to receive the 'crumbs from the table' that only the clergy had the right to receive.

2) We have discipline in the military.  That is not what filial relationship with God is about.

3) I prefer Rublev's Icongraphy "The Trinity" as an excellent depiction of the Trinity.