Strip link.
I suspect Ellen is overextrapolating from present trends, personally. Analyzing from the perspective of memes, religions are by force of evolutionary pressure hardy, virulent, and adaptable - and experimentally, the Ideological Turing Test shows that atheist ideas are understood by a significant number of people who nevertheless reject their conclusions.
That most Christians a century from now would be considered heretics by most Christians today seems to me obvious ... but I would be shocked if there was not a significant portion of the populace who identified as Christian in a hundred years.