Typically, the nature of betting on horses or playing the lottery is a simple matter of trying to win some money. If that is the goal, it is covetousness, which is a sin.
On the other hand, playing a game of cards, such as blackjack or poker, or maybe one of those electronic gaming machines, or various other things, are things that some people do for enjoyment, entertainment, or social interaction among friends (or strangers). In fact, even betting on horses, or sports, is something that some may do for the challenge and/or enjoyment. So, if a godly man gambles without any motive of greed or covetousness, but does so for any other purpose, such as perhaps some of the ones I listed, then he is not sinning. I already explained this in my original post, which you refused to comment on, therefore you are forcing me to repeat myself, which is rude.
So, if Jesus had had a deck of cards, would he have played a friendly game with some of his disciples around the fire? Who knows. I don't, and neither do you. And if you claim that you do then you are making up false doctrine.