“The difference between us and them is salaah.”
If you followed the average Christian around for one normal day , and you did the same with an average Jew, Buddhist, Hindu, or Atheist; there would be nothing whatsoever that would enable you to distinguish one from the other if you did not know beforehand what their beliefs were.
If you followed an average Muslim from morning to night, you would know almost immediately without any doubt what religion he belongs to.