What are the different beliefs about tithing..?

Question

in every religion?
How does the muslims,jewish, etc go about it, ......?
and what are the beliefs behind it?

Answer 1

Atheists and agnostics don't tithe, they just contribute to the wellfare of others.

Answer 2

Do hope the following information taken from www.lds.org will go towards what members of The Church of Jesus Christ of latter-day saints practice:

The law of tithing

The principle of tithing, or voluntarily giving one tenth of one’s income to God’s work, has been known since Old Testament times. Abraham paid tithes to Melchizedek (Genesis 14:17–20).
The law of tithing is how the Lord funds His Church. Today all faithful members of The Church of Jesus Christ of Latter-day Saints contribute one tenth of their income as tithing. Tithing funds are used for:

Constructing temples, chapels, and other buildings.
Providing operating funds for the Church.
Funding the missionary program.
Preparing materials used in Church classes and organizations.
Temple work, family history, and many other important Church functions.
Education.
When the Lord reminded His people of this law through the prophet Malachi in the Old Testament, He promised to bless those who were willing to pay an honest tithe (Malachi 3:10).