Stop being condescending. The truth will always prevail. Start using simple facts and let them decide for themselves. This is is only way. Those who cannot see, will never see. Move on.
"The truth is like a lion, it needs no protecting. Let it roam free and it will survive."
As a Christian I'd like to say, it's a thin line we walk.. the Truth is the truth, but it cannot be forced upon people. The have the free will to accept it or not. It's up to us to be a guiding light, not an enforcer. If they want to hear It, then so be IT. If they don't, then so be it.