Most religious people are only mildly so, adhering only in the vaguest sense to their religions. If they do not adhere to religion their ideas are about as inaccurate and dangerous, but they are less synchronized.
Many people utilize faith for productivity or resolution to the existential crisis. Without their faith they would be worse people.
I think it would be better to write a bible-for-atheists, with guidance for living in the modern world. This new scripture should motivate critical thinking, max(independence + transparancy), productivity (meaning, advancement of the race or a derivative race/structure) and satisfaction. Some understanding of the implications of evolutionary effects (selection, and how it reflects on the currently existing), mathematics, and the nature of energy and the universe (including entropy) must be included for a complete and worthwhile picture. Spirituality must be explained as a function of the brain, mythical events through statistics and human capacity ("No gods but man").
Simply because we're crazed monkeys and desperately require (very) approximate models in order to function. And simply because our emotions run amok of us more often than not.
Until we have this well-reasoned word-of-sanity, the bible (or the apparently more recent Koran) might be a better alternative to madness. A simple way to soothe troubled souls. Through the evolution applied before it's popularity, hard to disprove, infectious and attractive. The dark question you might be asking yourself is, where and with whom does that leave me?
I'm very deeply concerned about religion influencing law. This has happened forever, and will happen for the foreseeable future. Another demon for democracy, which leaves the innocent and well-intentioned, but ultimately foolish mass in charge. Or.. doesn't it :) ? (hint: chill)