Some scientists hold quite religious beliefs. Some are even zealots. Some people who were scientologist and became atheist are quite happy with their new religion. The thing with atheism is that its often posed as some kind of anti-religion; it isn't; not necessarily. Also, there are various forms of atheism. From strong atheism to agnosticism. One could argue: atheism is a vague definition. Well, so are other religions. There are so many sub-religions in christianity...