The Baltimore Catechism has as its sole justification to be a response to a particular moment in time in a particular culture. 

Both are long gone.

This comment ignores all that went before the Baltimore Catechism, and all that came after (not least Vatican II).

To use the Baltimore Catechism as a measure of what is "authentically Catholic" is like saying that we should reject any automobiles made later than the Model-T Ford ...