Yes, yes it is. Among the major Abrahamic religions gambling is an insult to God since you are putting your faith in chance rather than God.It is also sometimes considered usury.
Don't worry though, many of the things you do everyday are considered abominations. Things like eating anything from the water without fins. Or failing to shave the head of a woman without a veil. We live in a time when you can do whatever you want and easily find another person who thinks God is fine with that.
Deuteronomy 4:2
Gambling is not even mentioned in the entire bible, it is not a sin.
Leviticus 16:8, “And Aaron shall cast lots for the two goats, one lot for the Lord and the other lot for the scapegoat."
1 Chronicles 25:8, "And they cast lots for their duties, all alike, the small as well as the great, the teacher as well as the pupil."
Psalm 22:18, "They divide my garments among them, and for my clothing they cast lots."
Matthew 27:35, "And when they had crucified Him, they divided up His garments among themselves by casting lots."
Acts 1:26, "And they drew lots for them, and the lot fell to Matthias; and he was numbered with the eleven apostles."
In the bible it is called "casting lots". Which is a religious act because the believers do not think randomness is possible. God determines the outcome of a gamble. Not that I believe any of these things.
A lot is a PORTION, not gambling.
Casting lots means granting/determining portions.
Psalm 16:5 "The LORD is the portion of mine inheritance and of my cup: thou maintainest my lot."
