” But as often with the catechism, it appears Scripture texts are carelessly added for support after the doctrine is written, not as actually based upon it.”
You said it all right here... And unfortunately, not being conversant with God’s Word, they don’t understand.
And, apparently so, with the "Protestant" friends who supposedly agreed that the Mass contained "more" Scripture than their own worship services. Had the list been presented as first given, with no research on their part to validate said Scripture usage actually matched what was asserted, I guess it might appear to be true. However, as Daniel1212 has demonstrated, that "man behind the curtain" has pulled another fast one!