Islam:
Zakat is mandatory upon Muslims at 2.5% of your asset holdings kept for a full year (gold, cash,etc) to be given to 8 categories of beneficiaries. If you're bankrupt that year, you become the beneficiary instead!
Among these are the poor, the needy, newly converted Muslims, those in bondage, those spreading the religion.
You are supposed to go into your community, society, neighborhood, to identify who needs and are entitled to the zakat and give it to them directly. No need for intermediary.
Christianity:
The church demands that your tithes (up to 10% of your salary) only goes to it. They will do the distribution as they will.
Catholic, City Harvest, etc. That's how they get rich.
Now you see the scam?