This seems like a scam. If your intentions are purely good-I'm sorry no one has replied.  The thing is people work hard for BTC and wont donate them to some unknown charity. Do you know if 100% of funds go to the charity? Because by law, to be called a "charity" you only need to use the funds for some majority of "charitable causes".
People may donate if you give more info on the charity and if you talk about why it matters so much to you. Also, they would probably like a receipt of some kind. The best thing you could do: prove you made the donation you say you did.
Just FYI. I hope your motives are good and things work out.