First, any money given has to be sanctified by believers. Second, it has to be from people in fellowship and with the same core of beliefs--gathering unto the name of The Lord Jesus. Local assemblies never take money from Christians outside the fellowship, more so from the world of sinners. It is strictly prohibited (See 3 John 1:7).
Today organizations and denominations are asking for money from anyone because they are businesses. They all go after money and they also bring the law of 10% upon their followers, hence, receiving money both from saved and unsaved people. It became very lucrative for them and they will never stop because they mingle too much with the world. Besides, money is so good. They pray on people's hearts for the sake of the poor ones, but much of the money stays in the organizations' and denominations' pockets. Tax free! They all go under God's name or under the title 'Religion' but they have a board of executive and the like. They have the same idea if you look at a franchise like Macdonald's or Jollibee in the Philippines. They have a pyramid system.
One group that is from the Philippines is asking money from its website which is well done. It is a nice website asking for money to help for the construction of the building roof. They received a lot of money for several years but the roof was never been built. It is still at the same point as it was when they started asking for money.
So, be careful with your money. It would be better to help your immediate family than to give in these organizations and denominations. As a Christian, there are many different ways to help with your money. Maybe your mother would like to get a better car, or your brother needs extra money for medicine, or your house needs some repair, or you need to pay what you owe from credit cards, the government tax, or one of your staffs, etc. Allotting money for all the above mentioned is part of being a Christian. I remember a good working man who is a member of Westlinn denomination and is always faithful in giving his 10% to his denomination, but he can not pay his bills on time. For me, both is wrong since the Law (10%) is gone and having unpaid debts is not a good testimony.
Let us be careful with our standards. Our standards should be based on the Scriptures, not on lies.