Green defended the change when he was asked about it Friday at a session with the Television Critics Association for "The Voice."
Shortly before the ball dropped New Year's Eve, Green performed Lennon's song, "Imagine" for the crowd and NBC viewers. The singer changed a line that originally said "Nothing to kill or die for, and no religion, too." Instead, he sang "Nothing to kill or die for and all religion's true."
Some Lennon fans were angry, saying Green changed the meaning of the song.
But on Friday, Green said he believes in individuality and says "speak out and be yourself and speak your minds, speak your heart."
He pointed out he "meant no harm and no disrespect to anyone, anyone, any religious preference."
The Associated Press contributed to this report.