All are legitimate and all can be misused. An Avatar is an incarnation of God. When God comes down to earth in any life-form, then we call that an Avatar. I am born from age to age. A. Attaining freedom by unselfish actions is known as Nishkama Karma.
Selfish actions retard our goal.
Unselfish actions take us towards our goal. So Karma Yoga is the system of attaining freedom through selfless actions. A Karma Yogi may or may not believe in God or in any religious doctrine.