On second thought the Buddha did not deny divinity and he also recognized the value to be found in acting out of divine intention.
So there is no reason to say that using "namaste" somehow contradicts Buddhist principles except the part about the divinity being "inherent" which Im not sure it means. I got that from wicki.
"Beautifully taught is the Lord's Dhamma, immediately apparent, timeless, of the nature of a personal invitation, progressive, to be attained by the wise, each for himself." Anguttara Nikaya V.332