One of the five Pillars of Islam is "Zakat", charitable giving.
You can actually go on line and download a form for calculating your zakat obligation. Basically, you list all your assets other than your personal effects, home and furnishings and cars.
Include your savings, retirement funds, refundable rental deposits, outstanding loans to others, investments, business inventory, precious metals, stocks and bonds.
Then you take two and one half percent of the total. This is your zakat obligation which must be paid annually. You will find it probably works out for most to be more than tithing would
Sharia law prescribes how Muslims must distribute their zakat. It doesn't just go to their local mosque. Rather it must be divided up eight ways.
The book of Sharia Law, "Reliance of the Traveller" contains 33 pages of detailed information regarding Zakat. One eighth of one's zakat must go to each of eight specified categories.
The seventh category is "Those fighting for Allah", those fighting in Islamic military operations. It specifically mentions these funds are needed to provide them with "weapons, mounts, clothing and expenses".
Thus, all Muslims are obligated to support the jihad being waged against the West. This includes terrorism.
NOW, view this brief video clip in which Obama expresses his intention to make it easier for Muslims to pay Zakat.