"Tithing" is a Christian practice by and large, however "giving" is universal.
Here is a link to a very well-known Personal Financial Advisor - who happens to be Christian (though I don't hold that against him) - for whom I hold a great deal of respect.
Dave Ramsey on Giving
He talks about the wealth one receives when one gives. Yes, he uses the Christian Bible as his basis, but the source does not negate the message. And personally, I find the message very powerful.