Indian or Native American - which is more respectful?

 info given by a friend 

"First of all, it's important to know that the word Indian does not derive from Columbus mistakenly believing he had reached 'India.' India was not even called by that name in 1492; it was known as Hindustan. "More likely, the word Indian comes from Columbus's description of the people he found here. He was an Italian, and did not speak or write very good Spanish, so in his written accounts he called the Indians, "Una gente in Dios." A people in God. In God. In Dios. Indians. It's a perfectly noble and respectable word.  or you can call say Native "American", after those who slaughtered the tribes.