If reality gives no comfort, invent a belief system based on a non-existent entity because it makes you feel comfortable to think that there is more to life than life. Who doesn't want an eternal daddy to look after us?
Next, try to get everyone around - especially kids, they're more impressionable - to to believe the same thing. There's safety in numbers and you can get constant reinforcement of your belief system.
Build monuments and churches. Print books and pamphlets. They will make everything more real.
Use twisted logic to convince and reinforce wherever possible. There must be a god because monkeys can't make watches by shaking the parts around in a bag.
Above all - assume and loudly proclaim, that because you believe in something intangible and implausible, so does everyone else. Look, I have a nose and so do you. Therefore, we are the same and you obviously believe in something too.
If you try hard enough, you can even deduce (using twisted logic) that not believing in something is actually a form of belief.
I love it!