It definitely depends on how "religion" is defined.
To me, a religion involves an object of worship, whether it's god(s), nature, the sun, ancestors or whatever. So, I consider Buddhism as simply a practice or a way of life. If a way of life is considered a "religion" even if it does not involve worshipping anything, then okay, Buddhism is a religion. And so is being in the Marine Corps, or being a college student, or practicing any number of other lifestyles, and then the word religion has lost any real meaning anyway.
Just my take.
"To reach beyond fear and danger we must sharpen and widen our vision. We have to pierce through the deceptions that lull us into a comfortable complacency, to take a straight look down into the depths of our existence, without turning away uneasily or running after distractions." -- Bhikkhu Bodhi
"No man ever steps in the same river twice, for it's not the same river and he's not the same man." -- Heraclitus