The fact that a believer is happier than a skeptic is no more to the point than the fact that a drunken man is happier than a sober one. The happiness of credulity is a cheap and dangerous quality.
Love that quote! Sometimes the insight of our ancestors, in much less accepting times, really does surprise me.
Its true, its an interesting yet irrelevent question because it is impossible to make yourself believe in something that you don't, just because it makes you happier.
I would love to believe that next year I will win the lottery, and so I never have to work again and so jack it all in. Believing in this unlikely scenario will certainly make me happier, but have immediate and long term consequences.
In response to the original question, the emptiness & finality of death still upsets me a great deal, but I enjoy life made by my own rules, and without the guilt of not having prayed, read the quran, been to the mosque, or being bored with yet another religious sermon. Overall I think I am happier.