can you find me arguments by christian theologians who think that
gambling is not a sin?

If you want to know the truth about gambling, I have the answer for
you.  If you want to know what the world thinks, you have your answer
already, or else there wouldn't be gambling, even if the world knows
that it is a sin.  As a Christian, gambling is a sin.  Do you think
that Christ would gamble with your life?  I know that he came to earth
not to gamble with people's lives, but to do the will of the Father,
through the atonement, by suffering for the sins of everyone that
would repent and to lay down his life that he will be raised up again
to overcome death, that all may be resurrected.  There is no
justification to gambling, it is a sin.  If you can find justification
to why gambling is not a sin, then you are decieved by the Father of
all lies, for he loves to capture the hearts of men in his chain to
drag them down, so that they can be miserable like unto himself.  If
you want to verify my words to its truthfulness, here is a website
that some modern day apostle have spoken about gambling. 
http://library.lds.org/nxt/gateway.dll?f=templates$fn=default.htm$xhitlist_q=gambling$xhitlist_x=Simple$xhitlist_s=relevance-weight$xhitlist_d=$xhitlist_hc=%5BXML%5D%5Bkwic%2C0%5D$xhitlist_xsl=xhitlist.xsl$xhitlist_vpc=first$xhitlist_sel=title%3Bpath%3Bcontent-type%3Bhome-title%3Bhit-context%3Bfield%3Azr%3Bfield%3ARef

Pascal's Wager?
The 17th century philosopher and theologian, Blaise Pascal, thought
that one could not prove the existence of God definitively. But one
has to choose whether to lead a godly life or a selfish one. And the
outcome of the choice influences whether one goes to heaven or hell
(if God exists). Since there is no definitive proof, one has to bet
one's life.
So, at least one theologian gambled.
Amber

Pascal's Wager is found in his Pensees. Googling on Pascal's Wager
also yields a lot of stuff.

What the bible says about gambling. Isaiah 65;11.."But you men are
those leaving Jehovah, those forgetting my holy mountain, those
setting in order a table for THE GOD OF GOOD LUCK, and those filling
up mixed wine for THE GOD OF DESTINY.12. And I will destine you men to
the sword, and you will, all of you, bow down to being slaughtered,
for the reason that I called, but you did not answer; I spoke, but you
did not listen, and you kept doing what was bad in my eyes, and the
thing in which I TOOK NO DELIGHT you chose".
Any theologian [ a student of the Bible] who thinks gambling is not a
sin has not read the above scripture. {JEHOVAH;God`s name, Psalm
83;18. Exodus6;3}

I agree with both comments. We harm ourselves and others when we
engage in gambling in the usual meaning. Another meaning is making
decisions and acting upon them. Many of these are wholesome activities
that help build character, even if the results are unpredictable and
sometimes poor.   Neil

Hi Sml1,

I'll give you 5 to 1 that you will find answers both for and against.

Phil

It is interesting how people put into the bible what they believe should be there.
To translate "those setting in order a table for the god of good luck"
into "those who gamble" is definately a case of this.  People often
take a personal belief (such as gambling is bad) and then find
evidence of it in the bible.
The real evidence against gambling is much more involved with the
desire for money.  If the motivation of gambling is material gain
without working for it then there is a strong case in the bible
against that.  If the motivation is to have a good wholesome time with
the guys and have some good laughs then the bible speaks nothing
against this.

Weblog: Salvation Army Rejects $100,000 From Lottery Winner

http://ctlibrary.com/7264

Schenectady ? New York Lottery Director Margaret R. DeFrancisco today
announced Father Francis Coryer, the pastor at the Church of the
Assumption in rural Redford, NY, became the 100th player to win the
$1,000 a week for life top prize from the Lottery?s popular Win for
Life Instant game.

http://nylottery.org/ny/nyStore/cgi-bin/WinnerNewsDetail_Cat_333575_NavRoot_303_ProdID_992679.htm

A man was praying daily, "Please God let me win the lottery!". God
finally shouted, "Buy a ticket".

for Jack of few trades; Of course the Bible does not frown on people
having a good time. Even Jesus, when attending the wedding feast,
turned water to wine, and alcoholic at that. Six large stone jars each
holding ten gallons. The director of the wedding feast says to the
bridegroom, " Every other man puts out the fine wine first, AND WHEN
PEOPLE ARE INTOXICATED, the inferior. You have reserved the fine wine
until now" [ John 2;1-12]
The Bible does advise against gambling in particular because the
gambler is risking his earnings that should be used for more
worthwhile pursuits. Does your spouse have enough money for the weeks
groceries?.  Why put fuel into the flash car of the bookmakers when
kids worldwide are suffering and starving? Makes you wonder about
conscience?

pugwashjw:
You just did exactly what I spoke about, using your own morals and
then saying it's in the bible.  You say "The Bible does advise against
gambling in particular because the gambler is risking his earnings
that should be used for more worthwhile pursuits" and then go on to
state reasons why you believe that is wrong.  Where you never gave
evidence that the bible says that at all.  Not even a bad
interperitation of a quote :)