If you had been brought up in India, you would be believing in Hinduism; if you had been brought up in Iraq, you would be believing in Islam; and if you had been brought up in pre-Christian Norway, you would be believing in Nordic paganism. With such a perspective in mind, what makes you think that your religion, atheism, is correct? Why do you exude such a degree of certitude when your beliefs are merely the product of your upbringing?