I'm a Christian, specifically a disciple of Jesus Christ. I know people who believe as same as I do and people who do not. I understand why. People either don't think it's real or they believe in some twisted form which they don't like. Some people don't believe because they think they are "too smart" for this stuff. Some people think that Christianity is religion and they don't want to have anything with religion. Some people don't believe because someone who claims to be a believer hurt them. Some people don't believe because they are hurt by life circumstances and cannot image how this could happen with existing God. And another group of people doesn't believe in God because they believe in Satan or other so-called gods and think they are better/stronger/cooler/whatever.
What is good news? Good news is that Jesus is real and all the derived consequences based on this fact. He's more real than anything in this word. Why? Because everything here is fading but not Him.
I believe that whatever people should take seriously, they should have an experience first. Christianity is quite special in this because if you wish to have experiences you need to take it seriously first. That's why many people find Jesus first in some critical life situation. It's not a necessary scenario but unfortunately very often it's just like that.
My friends also understand a skepticism and all confusion of people can have in terms of their faith. For that they produced a movie where everyone can see that Christianity is a real stuff. Or at least there is something serious behind it. They can see It's not just some doctrine, theological or philosophical stuff to feel better but much, much more than that.
So to the topic question? I have an answer but my answer works just for me. You need to have your own answer, undeniable one. So take you time, watch for yourself and then seek and find until you have it!