Being Spiritual But Not Religious
It may be enough in some special circumstances. But in normal circumstances, it is against human nature to not seek message of God in this world, if one believes in God. It is inevitable that one is bound to seek more answers. And in that search, one may or may not subscribe to any religion; but this search is inevitable. Or alternatively, one is bound to react or make a decision when presented with message of God. Therefore, giving a sweeping statement like this would be against human psychology. Following Video may also be helpful: https://youtu.be/hEVav2jcK00