If you're an adherent of most religions you believe that out of the, say, 10,000 religions that have existed on earth, 9,999 are false. If you're an atheist you believe that 10,000 are false. Seems a bit presumptuous for anyone who is sure that 9,999 of thing X are false to think they are in any way different from the the person who is sure that 10,000 of thing X are false, no?