https://www.accesstoinsight.org/tipitak ... .than.htmlIf one practices the Dhamma, one leads a blameless life in the here-and-now. Even if the afterlife and karmic results do not exist, one has not lost the wager, for the blamelessness of one's life is a reward in and of itself. If there is an afterlife with karmic results, then one has won a double reward: the blamelessness of one's life here and now, and the good rewards of one's actions in the afterlife. These two pragmatic arguments form the central message of this sutta.
It appears that secular Buddhists are using the Apannaks Sutta to justify their teaching.
That can be used to reject rebirth, Kamma Vipaka etc.
However, I believe that they still requires to follow the basic five precepts and the Noble Eightfold Path etc.
Doug Smith said that the secular Buddhist follow the Noble Eightfold Path.
But I am not sure how they do it without right view.