Impossible to say whether any believer is happier than any skeptic - happiness being so subjective. All AB's experience can tell him is that he is happier as a believer than he would be as a skeptic.
... just like the drunkard is happier than the sober man, even though the source of his happiness is ultimately a toxic and noxious source, all the more so in quantity. Bernard Shaw's point stands unchallenged never mind undefeated.
Moreover, the egregious Burns has never been a sceptic - how would even know in which state he'd be happiest?
Our current understanding is based on our current knowledge and it will be revised as new information is discovered.
If it's discovered. Well done for knowing how science works, but we know enough to know that there's a small percentage of DNA which doesn't code for proteins and has no known regulatory function. That's where we are, without inventing fantasy scenarios of the future that might be the case some day, one day, maybe, might be.
That's science fiction rather than science.