I find most people on the forums as looking at Christianity with quite a narrow view. I gave up trying to evangelize to these people because they don't bother to look it up themselves and instead take it from interpretation and second-hand sources.
If you are still trying to evangelize and everyone is being stubborn then I have one piece of advice for you:
Matthew 10:14-15
And whoever will not receive you nor hear your words, when you depart from that house or city, shake off the dust from your feet. Assuredly, I say to you, it will be more tolerable for the land of Sodom and Gomorrah in the day of judgment than for that city!