I answered science, although I would like to slightly amend that to "science and philosophy". The fact of the matter is that where science, philosophy and religion disagree on the way the universe works, science usually has the facts on its side, philosophy has logic on its side, whereas religion has little to show for its position except a leap of faith based on scripture, dogma and a lot of twisted rhetoric.
Religious people tend to attack straw men like "science does not have all the answers" (nobody claimed that it does, and, for that matter, neither does religion). And we have seen in the past that as science progresses, religion retreats. The weather was the domain of god until science came up with theories about how climate works. The creation of man was the domain of god until science showed how evolution works. Religion has been marginalized to the role of "stop gap" explanation for everything we do not (yet!) have a scientific explanation for.
Of course it is possible that some higher being exists. Science can not disprove that. But allow me to quote a famous bit by Bertand Russell that is relevant to this observation:
"If I were to suggest that between the Earth and Mars there is a china teapot revolving about the sun in an elliptical orbit, nobody would be able to disprove my assertion provided I were careful to add that the teapot is too small to be revealed even by our most powerful telescopes. But if I were to go on to say that, since my assertion cannot be disproved, it is intolerable presumption on the part of human reason to doubt it, I should rightly be thought to be talking nonsense. If, however, the existence of such a teapot were affirmed in ancient books, taught as the sacred truth every Sunday, and instilled into the minds of children at school, hesitation to believe in its existence would become a mark of eccentricity and entitle the doubter to the attentions of the psychiatrist in an enlightened age or of the Inquisitor in an earlier time."
So for me, personally, science and philosophy together completely and utterly make religion obsolete as far as factual truth goes.
Regardless of truth, religion is, of course, an important cultural phenomenon, but whether or not it is a desirable cultural phenomenon is also doubtful. Given the amount of violence, bigotry and human suffering inherent in most religious systems, I'd say we might be better off without it.
