Hmm .. not really true.
Tithing is a living tradition, too bad the word is most often
associated with Christianity.
The Jewish has the concept of Tzedakah -
The Meaning of "Tzedakah"
"Tzedakah" is the Hebrew word for the acts that we call "charity"
in English: giving aid, assistance and money to the poor and needy
or to other worthy causes. However, the nature of tzedakah is very
different from the idea of charity. The word "charity" suggests
benevolence and generosity, a magnanimous act by the wealthy and
powerful for the benefit of the poor and needy. The word "tzedakah"
is derived from the Hebrew root Tzade-Dalet-Qof, meaning
righteousness, justice or fairness. In Judaism, giving to the poor
is not viewed as a generous, magnanimous act; it is simply an act
of justice and righteousness, the performance of a duty, giving the
poor their due.
From http://www.jewfaq.org/tzedakah.htm
So the Jewish "tithing" is much holier and goes much deeper than
the Christian one. Everyone complains about the Christian one -
that the pastor pockets the money, $$ used to build titanium
building etc. And non Christians just cannot understand why tithing
is an act of obedience to God. Wah leow .. obey God so that pple
can build titanium buildings? 
But if you read the url above you realize the Jewish "tithing" is
an act of social support. And you don't only give to the Jews, for
whether Jews or gentiles, we are still children of God.
"Where there is no bread, there can be no Torah. Where there is no
Torah, there will be no bread" (Pirket Avot 3:17).
