This is a solicitation call from, what I understand, is a homosexual muslim group called the Purple Jihad. They are seeking donations for the rights of homosexual muslims to have sex in muslim countries and the destruction of Israel. If you call them back you do not get to speak to anyone, you are just connected to a voice that says that if no one has called you, they will get to it. They also give you an extension to press to put you on “their” do not call list. If you are dumb enough to do that, they will then call you forever and when you complain to the “do not call registry” they will use your contact with them as proof that you are in a relationship and therefore exempt from the law.
Do yourself a favor and block the number; unless of course you want to donate and or otherwise support the purple jihad movement.