This is not meant as a demand of de-emphasizing proper Christian living; in fact, our lives in how we ought to live, is extremely important; but it should NOT come at the expense of evangelism.
Furthermore, a watered-down gospel IS NO GOSPEL AT ALL.
There's a reason why God's eternal character is well detailed in scripture (Exodus 34:6-7) and why Paul devoted the 1st half (1:18-32), 2nd, and 3rd half of chapters of Romans to the notion of our depravity. It is to show sinner their utter need for a Savior.
And if we remove God's character and sin from our Gospel message, then we don't have the Gospel at all,
For if we do so, we nullify the Gospel's sheer magnificence; in other words, how gracious and loving God is in sending His only Son, and how wonderful Jesus is, in fulfilling God's will to die for us on the Cross; and then rising again from the dead.
All this, to save us.