I do not believe that the Gospel of the Catholic church is the catechism. The Gospel is the Gospel of the Catholic church.
You’d know this too if you read a catechism.
I suggest you read one if you want others to take your assessment of Catholicism and it’s teachings seriously.
I would expect only those who are granted the eyes to see and ears to hear to realize that the message of Rome is heretical. The very Book which they errantly claim to have delivered provides for no such additions to the Gospel as sacerdotalism, purgatory, indulgences, mariolatry, genuflecting, absolution, sacraments, pater nosters, confessional booths, papalism, or any other of the quazillion other fantastic myths shoved down the throats of the unsuspecting parishoners. These additions come straight from the traditions of men, by the agency of hell, but managed by God Himself. The deluding influence is at work.
And, it is "...its teachings seriously."