No. It simply means that either no or insufficient evidence for the existence of their deity has been provided by theists. There have been 10000 gods worshipped by humans throughout history and Christians don't believe in 9999 of them so they are virtually atheists themselves.
It's amusing that <religion x> and its representatives on earth generally get very upset when people say it's nonsense and their god or gods don't exist, but are usually happy to say exactly the same thing about every other religion that humanity has ever dreamed up.