No!!! Gambling is a sin only for those who does not know the techniques and tactics of gambling. Gambling is a form of art if you are betting in sports or something technical. In such cases it will be proven as easy money earner.
If you are catholic or muslim you will know it gambling is a sin.. just relay on video of the passion that jesus distruct the gambling tables..
And also if you are always go to church every week you know it..