Considering that the vast majority of the world's population of humans believes in some sort of divine entity or god, I would be inclined to think that believing comes quite easily to us.
Theoretically speaking, I don't see why it should though.
To me the easiest thing in the world is to be a non-believer, because the world seems to me to scream out, "Accident!"
I would argue against this idea that the believer's way is the easy and lazy way, and the hard, brave, and rugged way is the way of the non-believer.
I suppose there are people to whom the world screams out just as emphatically, "Design!"