I am trying to find a survey or study regarding young-earth creationism

students. Here are two descriptions I have:

"Barnum took a survey that stated upwards of 80% of kids raised in
evangelical churches departed from their faith by the time they finished
college because of evolution."

"I'll close by telling you about a survey that was conducted among high
school students who REJECT Christ. According to this survey, about 70% of
these kids said that they rejected Christianity because of its claims that
the Earth is 6000 old."

Does anyone know where I can find this survey? I have tried Google but I
can't seem to hit the right keywords. That reference to "Barnum" may be
"Barna", as in the George Barna research group. I contacted them a month
ago but received no answer.

Any ideas?

Carl Drews