Based on the below referenced article it appears that the NAR doesn't support non profit organizations such as Nehemiah & Home Ownership Providers from providing down payment assistance to potential home buyers.
http://www.realtor.org/fedistrk.nsf/currwklyrpt/government+affairs+weekly#report_4_07_23_2007
NAR Submits Comments on HUD Proposed Standards for Mortgagor's Downpayment Assistance
On July 17, 2007, NAR submitted comments to HUD on Standards for Mortgagor's Investment in Mortgaged Property, 72 Federal Register 91, 27048-27051. NAR supports downpayment assistance programs to help borrowers purchase a home. Downpayment programs take many different forms. For example, NAR has been a strong supporter of the American Dream Downpayment Initiative (ADDI). Another way buyers receive downpayment assistance is through the help of non-profit organizations. Certain non-profits have raised concern because they were taking contributions from property sellers, subtracting a fee, and then granting the remaining money to buyers of the same property. In essence these non-profits created a "seller-funded" downpayment program, which NAR believes can result in home price inflation and risks for increased delinquency and foreclosure. In an effort to preserve qualified downpayment programs, NAR strongly urges HUD to construe the limits on non-profit downpayment assistance as narrowly as possible.
The best "non-profit" down payment assistant for home buyers would be a "ZERO" down payment FHA program. Why not do that? Then we wouldn't need the folks in the middle.
It's so easy, it can't possibly work.