You are a very strange and difficult type of Catholic. One who has invented a notion of infallibility that is not taught by the Church. 
       In any case, no Catechism trumps the Word of God. 
       And, contrary to what our doctrinal police woman says, (Joan Piwowar, this means you) I disagree on issues of orthodoxy not sexual morality. No hot-button issues here, just whether the Church is sometimes arrogant. Check out Catholic Arrogance dot org. 
      I attribute all of the crimes of history, from the genocide of the Cathars and the Inquisition to recent sexual abuse and the cover-up to bad Eucharistic theology and Biblical ignorance (not a fundamentalist). Priests and clergy playing God and alienating the "faithful" from themselves and each other and God by not taking Jesus at His word and inviting the Holy Spirit to dwell within. 
     The Catholic church as times has collaborated with evil in society under the pretense of righteousness. Don't you do the same.