The Hypocrites [a group in very early Islam]were considered to be condemned to eternal damnation not because they pretended to believe what they didn’t  truly believe.  Rather, it was because they used religion to gain worldly advantage.  They were “nice” not because they believed that brotherly love was the only road to true salvation, but because being nice meant that they would be at the top of the list when good jobs opened up, so to speak.  There are therefore no outward signs of true religiosity; there are no particular characteristics, such as “niceness,” that can be associated with religiosity.  If society happens to associate certain characteristics with saintliness, the truly saintly will make sure they do not exhibit such characteristics.  Anything that leads worldly advantages is of the Devil.