Let me understand this ..... you are saying ... if there is a person who prays to god regularly and performs all the rituals ... but goes and commits crimes like murder of innocent people .... he can be forgiven by god ... but some one who has spent his life helping people but *does not believe in religion *... he get no forgivness!!!!!!!
There is a difference in "shirk" and "not believe in religion", for clarification please visit Religion forum :)