Is a question many atheists have been asked in one form or another. Many have given varied answers to the question and my contribution, though not new, is to say evidence that would be accepted by any reasonable person/observer.
But who is a reasonable observer/person?
Abstract philosophy and exercise is only suited for that person who is well fed and housed. The practical man or woman has use for philosophy to the extent to which it is relevant to their lives and until professional philosophers address issues of practical men and women, their works will remain in university bookshelves read only by other professional philosophers.