The following is from an essay by Louise Antony

Looking back on my development from devout Catholic girl to adamant atheist, I think that it was its bottom-line dogmatism that drove me away from the Church, and indeed, from the very possibility of religious faith. "Faith" presents a paradox: if a doctrine can be defended on rational grounds, then it needn't be taken on faith. But if it cannot be defended on rational grounds, why should you believe it?