World Vision is one of the world's largest private charities and was originally founded as a Christian organization. Apparently a majority of their current representatives felt that being saved from sin was no fun. Instead, they are now promoting a "gospel" of salvation to sin. That is, they have embraced a total negation of the most important Christian belief. These things are usually a long time in coming, so I am surprised no one mentioned this a few years earlier.
I had it in my mind that World Vision was related to Samaritan's Purse, but this seems to be in error: Both organizations were founded by the same person, but they are independent. Franklin Graham has a statement here on the decision of World Vision to declare for Depravityism.
A side note is that I usually don't get too worked up over what is or is not a "cult". Yes, there is a lot of differences and really crazy beliefs out there, but the worst of the cults seem to understand that sin is bad and God wants to bring us into a relationship with Him by changing us. Most of these are still much closer to Christianity than atheism. Modernists, however, are drawn to promoting sin, which is a vector that leads further away from Christianity than atheism. Of course abortionists, pimps, drug dealers, and pornographers do the same, but at least they have a profit motive that they can cite as a pretext. The modernist, however, advocates evil for no other reason than the fact that evil is evil.
"But false prophets also arose among the people, just as there will be false teachers among you, who will secretly bring in destructive heresies, even denying the Master who bought them, bringing upon themselves swift destruction. And many will follow their sensuality, and because of them the way of truth will be blasphemed. And in their greed they will exploit you with false words. Their condemnation from long ago is not idle, ad their destruction is not asleep." - 2 Peter 2:1-3
There is nothing new under the sun.