There are a lot of answers I could give to this. Most of them involve politely ignoring the parts of the catechism I don’t like, selective belief and a discussion of the church as in-the-world too often of-the-world. Round it out with something about loving a fallible institution even when you don’t agree with it, etc.
But my favorite answer is: the Nicene Creed.
I’m sure you’ve seen it before, the Nicene(-Constantinople) Creed was ratified at Council of Nicea in the 4th century AD, one of the very first Catholic councils. It, or the Apostles’ Creed (which is from around the same time, I just prefer the Nicene), is said at every mass. If Catholicism has a litmus test, this is it.
We believe in one God, the Father almighty, maker of heaven and earth, of all things seen and unseen. We believe in one Lord Jesus Christ, the only son of God, eternally begotten of the Father, God from God, Light from Light, true God from true God; begotten, not made, one in being with the Father; through him all things were made. For us and for our salvation he came down from heaven, by the Holy Spirit was born of the Virgin Mary, and became man. For our sake he was crucified under Pontius Pilate, he suffered, died, and was buried, and rose again on the third day he rose again, in fulfillment of the Scriptures. He ascended into heaven and is seated at the right hand of the Father. He will come again in glory to judge the living and the dead and his kingdom will have no end.
We believe in the Holy Spirit, the Lord, the giver of life, who proceeds from the Father and the Son, with the Father and the Son is worshiped and glorified, he has spoken through the prophets. We believe in one, holy, catholic and apostolic Church. We acknowledge one Baptism for the forgiveness of sins, we look for the resurrection of the dead and the life of the world to come. Amen.
It is my firm belief that if it is not somewhere in the Nicene Creed, The Our Father, or explicitly stated by Jesus, it’s a secondary concern within the faith. Anything else is a distortion of the credo, a placing of sexual mores (I’m assuming that’s what you’re talking about) above theology, above the sermon on the mount, above forgiveness and resurrection and bread and light from light.
and that’s not what you’re called each sunday to reaffirm your belief in.
so fuck it.