Muslims give more money to charity. than people of other religions. The survey has been done only in the UK, so Warren Buffett, Bill Gates and other lion-hearted atheist donors are not in the list. It can be true that Muslims give more money to charity than people of other religions.

More than three in 10 Muslims, Catholics and Jews donated money during 2012, ICM Research found.
Followers of Islam gave an average of $567 compared to Jewish givers who donated around $412, according to the survey of just over 4,000 people in the U.K.
Christians gave considerably less. Protestants donated an average of $308, while Roman Catholics gave around $272, the poll found. Atheists averaged just $177.
In total 4,036 people answered the question: “How much, if at all, would you say you generally donated to charities last year?”
Respondents were asked to exclude buying items from charity stores or sponsoring someone for a charity activity.
The finding follows a recent Pew Research Center survey of more than 38,000 Muslims in 39 countries, which found that 77 percent said they donated to charity.
Data from the online platform JustGiving.com also shows that Muslims are increasingly using online methods for their Zakat — the Muslim practice of charitable donations — with a growth of close to 70 percent over the last two years.
“Our data shows many of Britain’s Muslim communities are at the forefront of digital giving, driving an increase in Zakat donations,” Zarine Kharas, their CEO explained.

I am happy for those Muslims who give charity and for those who receive it. It’s such a great thing for humanity. But why do Muslims give charity? Is it because they care about humanity? Maybe it is not important what motivates them to be so generous, they are generous, that’s the great thing. But my curious mind doesn’t stop here. It starts to find the reason of Muslims being kind and nice. The reason is: Allah asks Muslims to give zakat from the part of their income to poor Muslims. Muslims follow the orders of Allah because Allah promises them heaven if they do.

Muslims have to believe in five pillars of Islam if they want to go to heaven. The pillars are: (1). Believing in the Oneness of Allah and that Muhammad as His Prophet; (2). Offering daily five prayers to Allah; (3) Fasting in the month of Ramadan; (4). Giving Zakat [alms] to the indigent Muslims and (5) Performing Hajj in Mecca at least once in one’s lifetime, if one is physically able to do it.
Would they give zakat to poor non-Muslims or poor atheists? They would not. They would have given, if they were really concerned about humanity. But it is not the case. They ask poor Muslims whom they give zakat to pray for them so that they can go to heaven.

(Allah his Prophet Muhammad frequently promised believers of Islam with lustful heavens and erotic pleasures of various kinds.)

Syed Kamran Mirza gives vivid pictures of heaven where Muslims are desperate to go.

Zakat goes to poor Muslims, zakat also goes to build mosques and madrassas, and goes to Jihad. A percentage of zakat must go towards Jihad. — It is one of the common laws of Islamic Sharia which is practiced in the Sharia-based countries.

The Hadith says:

p.4.427
Heaven has 8 doors. He who prayed will be called from the door of prayer. He who paid zakat will be called from the door of zakat. He who fought will be called from the door of jihad.

Sahih Bukhari; No. 1214.