I didn't know Andrew Stanton was a Christian. Yet, here are his interviews
with Christianity Today and WORLD (with some snippets), respectively:

http://www.christianitytoday.com/movies/interviews/andrewstanton.html

*Interviewer: But guys like you and others at Pixar, and other Christians
like Scott Derrickson and Ralph Winter, are bringing biblical themes into
the movies without making them feel "preachy." Where are you on all of that
thinking?*

*Stanton:* I agree with what you said. Just because you're strong in your
faith doesn't mean that you suddenly have to be dumb and pander to a certain
audience. When did that become a rule? I think you were given a brain to use
it, and I think you were given talents to use it. And so the same
intoxicating, seducing talents and cleverness and wisdom that you see in
what may be considered "secular" entertainment, there's no reason that those
things should be held back for anything else, I like to think.
http://www.worldmag.com/articles/14127

True, the foundation for the story is that humanity has left the planet
heaped in garbage. But far weightier themes—like how technology distances us
from the wonder of creation and how that distance cripples us
spiritually—play a bigger role. In fact, if Stanton criticizes people for
anything, it's for worship of leisure. Because they live to be cared for
rather than to care, the few human beings WALL•E meets have become, to use
Stanton's words, giant babies—literally feeding on milk rather than solid
food. In contrast, WALL•E, the meek little trash collector, accepts
stewardship in a way that people have rejected. And because love springs
from service, he comes to love the creatures that inhabit Earth. That's not
an environmental message, it's a biblical one.

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- Abe Yang