[BipolarBob]

is a sin because it introduces human will contrary to the will of God.

I disagree. You can't prove that. But look around and see natural resources shrinking. Somebodys going to starve because somebody else misread the Bible.

[Philo-Junius]

So much propaganda crammed into two sentences.

Which natural resources are shrinking? I refer you to the Simon-Ehrlich wager: http://en.wikipedia.org/wiki/Simon-Ehrlich_wager.

Are resources mismanaged by the transnational overclass? Certainly, but don’t blame the baby for its starvation when it is being starved by the elites’ unwillingness to countenance any action against their kleptocratic client states.

[annalex]

You can't prove that

If it is a will of God for the marital act not to result in a pregnancy, no pregnancy will result without contraception.

A couple who engage in contraception wish to bypass the will of God in favior of their own will.

Here, I proved it.

[A.A. Cunningham]

You can't prove that.

That's what Onan probably thought too.