Alceste
Vagabond
Fair enough, the church shouldn't lie about condoms.
But why would it affect anyone outside the church? I still don't understand that.
Buttons, the reason these teachings ("condoms are nets that let sperm and HIV through, etc") infect minds outside the church is that they are not presented as Catholic opinions, but as facts. The religious right sometimes even goes out of their way to conceal the religious origins of false statements of fact regarding condoms. Abstinence education in the US is one example.
When one person states that it is a proven fact that condoms are permeable to HIV, or intentionally laced with HIV, or hasten the spread of HIV, you don't need to be religious to believe it. Maybe a bit lacking in critical thinking skills, but not religious. False statements of fact - particularly in an environment with a high rate of illiteracy, which requires people to rely on "word-of-mouth" to understand the world - go straight into the vein of an undereducated population and emerge as "common knowledge".
You can't say that about things like "extramarital sex is a sin". When people hear things like this they recognize it as an opinion, not a fact. People feel free to disagree with opinions, but not facts. (People who are not apologists for a lying pope, that is.)