Test it!

Christianity is not an opinion. It is not one religion among many - it is the only way. Jesus said, "I am the way, the truth and the life." Its claims are phenomenal but there are two problems. The first is that believers do not 'sell' their faith, or in other words, evangelise as The Great Commission requires them to do. The second is that the majority of the world population is so spiritually dead that they do not even recognise that they are hurtling towards a Godless eternity.
The first problem bears directly onto the second. Christians must not be ashamed to proclaim, and loudly, what they are. Why the embarrassment? Do they not really believe that there is a heaven and a hell? Or do they not care? Perhaps they have too much 'respect' for the mistaken beliefs of others?
The difference between Christianity and the rest is that there is an empirical test, or rather - a promise. "Seek and you will find." It's true. I've been there and done it! You can add "Taste and see that the Lord is good."