I went back on Archive.org, and it does seem to be the case that they've been up front about their religious affiliation (online) at least since 2013, when I stopped looking.
The pitch K4K has had for most of this time isn't about the good that they do so much as that they're very good at picking up your car conveniently and maximizing the IRS impact of the donation.
(Donating your car is probably not a good deal and you might be better off just having it bought and picked up by a salvager, and then taking the money and donating that.)
That was back in the days when if you had mortgage interest, it was to your advantage to itemize deductions and include charitable donations. With the much higher standard deductions now, far fewer people file a Schedule A.
>and it does seem to be the case that they've been up front about their religious affiliation (online) at least since 2013, when I stopped looking.
If they were only soliciting funds on their website, which made it clear that your donation was being used to send 17 and 18 year olds to Israel, that would be a different story. In reality, the vast majority of their donations come in from people who are totally unaware because they hear the radio jingle, which is sung by little kids, and makes no mention of their religious affiliation or their affiliation with a foreign country. Here in New York I've been hearing these radio ads on a daily basis for literally decades and had no inkling about the true nature of this "charity" until today.
People donating things aren't generally looking for a good deal.
I don't really care about the religious aspect, but if you're calling yourself kars4kids, the proceeds really should go to kids. In general, charities should have to be more up front about how their donations are being used. With rules being stricter as they get bigger. That is to say, the local fire department doesn't need to tell me how much of the hoagie sale is going to beer, but once you're buying commercials there should be some transparency.
As far as car donation options the purple heart is still around. I think at one point either the EFF or the FSF used to do it too, but I can't find it anywhere. Does anyone remember that?