What the heck does this actually mean? You want me to "play ball?" Fine.
Mother Teresa
Pope Francis
Henri Nouwen
John Wesley
Martin Luther King, Jr.
There's five names - five famous names - of people whose actions and words pretty clearly demonstrate that belief in Jesus has a tremendous effect on a person's life.
I could name so many more, some names would be familiar to you and many would not. Either way, to claim - in the form of a question - that belief in Jesus necessarily has no effect on a person's moral life is asinine and easily disproven. Does a belief in Jesus automatically make someone a better person? Of course not. But it can, it has, it is, and it will continue to do so for many.
I believe "the ball" (of whatever game you think it is that we are playing) is now in your court.