Raoul, more flies are caught with honey than vinegar. (Assuming you want flies.)

You have to love-bomb 'em. Shower 'em with respect and affection.

Find a common ground, and build from there. Find something upon which the two of you are in agreement, and then extrapolate.

Gently, slowly, one point at a time.

Value their opinions, as being genuinely theirs and derived from much careful thought.

Frequently invoke the Deity as an example of higher-order tolerance and acceptance. "God", if you will, Raoul, without the "damned".

Example: FOR GOD'S SAKE, DON'T THROW IN FACTS. They just confuse the people and the issues, tend to embarrass 'em.

You might want to AVOID DISCUSSING MORALITY. Same reasons. You get the idea.

Instead, be a channel of peace, understanding, joy and love. Like me.

I'm surprised I've had to give you this lecture, but then you live close to France, don't you? Isn't Bellgum over there someplace between Norway and Finland, or Denmark, or Poland? Lichtenstein, or Latvia? Aren't those subway stops on the way to Paris?

Woof (he - he - he - he!! Just a woofin', Raoul, just a woofin'!)