Many will say the same, but I guess it is because they aren't into Bible reading that deep, I understand but it is not true that there is no where in the Bible that says that gambling is a sin.
The first Timothy 6:9, 10 says the following..
Gambling even with the smallest amount can arouse a destructive love for money.
Isiah 65:11 says the following....
Gamblers often rely on superstitions or luck. However, God views such beliefs as a form of idolatry, which is incompatible with his worship.
When something isn't compatible with your God's worship that makes it a sin, some part sounds like protection of the people from destruction too but all saying the same thing.
Here is another, from the book of Galatians 5:26, it says
Gambling can arouse an unhealthy competitive spirit, which is disapproved in the Bible.
So now are we going to keep saying that there is nowhere in the Bible that says gambling is a sin?
I'm really not happy with the way you choose to misquote the bible all in the name to prove points, it is completely useless and this shows that you are not a Christian by religion and in a way be against it. The bible only talks about excessive love for money that triggers a get rich quick scheme which implies disobeying the commandments (like stealing and more) but no where did the bible talk about gambling.
People now see religion differently, the deal to one's eternity is something personal and not a matter of any religion. Religion is just like a step/guide towards achieving that eternity, so there are rules being laid by the fore rulers to help us in this our journey, this rules keeps us on the better part so we do not mistakenly fall into breaking those commandments. So I do not see how religion should affect me gambling.