I suppose because the Cross represents Jesus’ taking upon Himself the sins of humanity and relieving us of them so that we may have eternal life. Or not all sins, only the sin of Adam and Eve? And is there a different significance of the Cross to some Protestants as compared to Catholics and Orthodox?
A good Baptist preacher would maybe be humanist, ground it in G-d’s kingdom here on Earth, in the here and now.
First the preacher makes the mood sombre, takes his audience down a peg, a bit of introspection and navel gazing for the good of their souls:
*“Wars, violence, economic conflicts that hit the weakest, greed for money, power, corruption, divisions, crimes against human life and against creation! And our personal sins: our failures in love and respect towards God, towards our neighbor and towards the whole of creation.
"Do we feel weak, inadequate, powerless?”*
Then, having got the crowd where he wants them, the Baptist preacher whips them into a frenzy, makes their little faces beam, sends them home full of beans:
*“God is not looking for powerful means: it is through the Cross that he has conquered evil! We must not believe the Evil One when he tells us: you can do nothing to counter violence, corruption, injustice, your sins!
“We must never grow accustomed to evil!
“With Christ, we can transform ourselves and the world. We must bear the victory of Christ’s Cross to everyone everywhere, we must bear this great love of God."*
Yea! go the crowd. Hallelujah! Glory be!
But that was the Pope preaching. When did the Pope become a Baptist preacher?