There is confusion in popular discussion about how many Americans are atheists. Here I review how many Americans are atheists, and why there are such varying estimates of this number.
Short answer: 3%-5% of Americans are atheists.
See "Link to External Source Article" below to read further.
We don't want to step on anyone's toes here, but since The Urantia Book is fully grounded in spirituality and religion, the idea of atheism runs counter to its teachings. But it gives good and sufficient reasons that atheism falls short as a philosophy of life.
From The Urantia Book:
56:10.3 Philosophy you somewhat grasp, and divinity you comprehend in worship, social service, and personal spiritual experience, but the pursuit of beauty—cosmology—you all too often limit to the study of man’s crude artistic endeavors. Beauty, art, is largely a matter of the unification of contrasts. Variety is essential to the concept of beauty. The supreme beauty, the height of finite art, is the drama of the unification of the vastness of the cosmic extremes of Creator and creature. Man finding God and God finding man—the creature becoming perfect as is the Creator—that is the supernal achievement of the supremely beautiful, the attainment of the apex of cosmic art.
Hence materialism, atheism, is the maximation of ugliness, the climax of the finite antithesis of the beautiful. Highest beauty consists in the panorama of the unification of the variations which have been born of pre-existent harmonious reality.