Theory 3. God does exist, but there is also a devil.

Nature has a mix of good and evil (thorns have roses; dolphins
live near sharks; a leopard kills for fun but is gentle with its cubs).
And we humans have a mixture in us: we can give to charity and
an hour later yell at someone we love.

Looking at the natural world (and yourself) is a bit like finding a
computer with a virus. You see the careful, intelligent design, but
you can see it has a bug.

This is what the Bible teaches.

But this raises more questions! Such as ...