But not where in the bible that gambling is referred to as a sin in christianity.
Well, I can categorically tell you that gambling is a sin in Christianity if you know your Bible, the Bible does not have to categorically tell us that gambling is a sin, same way there are many sins in the world today that the Bible does not speak particularly of.
As a Christian, knowing how the Bible is written will help us understand many things which are hidden from the eyes, in the Bible, there are words that don't mean what your mind tell you they mean, God sometimes speak in parable, is up to us to use our brain to know the meaning..
Gambling overtime leads to loses and many other mishaps/sins like greed, addiction, stealing, envy, jealousy, hatred, loss of trust and faith in God etc.
How can a habit that leads to all those types of chief sins not be a sin in it self.?
Am still a gambler anyway, but I can't hide the truth solely because am a gambler, God will punish me if I do.