Just my opinion, I believe we are more effective when speaking to people of a faith we have considerable knowledge of. You have probably personally seen people with very little knowledge of Islam attempt to convert you. Just as you find them to be very funny to the point of being ridiculous, so it is with us when we attempt to speak to a person of a faith we have little knowledge of.

Those of us who are reverts should feel duty bound to use our knowledge of the religion we left, to help show our friends why we chose Islam. I never see any need to belittle or criticize another person's beliefs. Let the truth speak for itself and let the person choose on their own, with no coercion. Far better to speak of the beauty of Islam, than to condemn the beliefs of another. Better yet, far better for us to live as Muslims and show what it truly means to be a Muslim.