But why not donate direct to one of those two organisations? In the words of the website

When donating via Non-Believers Giving Aid, you are helping to counter the scandalous myth that only the religious care about their fellow-humans.

You are also helping to promote aggressive bigotry. Assisting hypocritical opportunists. Oh and because neither Doctors without Borders or International Red Cross is a development agency you are making a default choice about effective help – Haiti’s needs will not go away any time soon.

But it’s your money.