The only cross in all of history that was turned into an altar was the cross on which Jesus Christ died. It was a Roman cross. They nailed Him on it, and God, in His majesty and mystery, turned it into an altar. The Lamb who was dying in the mystery and wonder of God was turned into the Priest who offered Himself. No one else was a worthy offering.
Artificiality is one curse that will drop away the moment we kneel at Jesus' feet and surrender ourselves to His meekness. Then we will not care what people think of us so long as God is pleased. Then what we are will be everything; what we appear will take its place far down the scale of interest for us. Apart from sin we have nothing of which to be ashamed. Only an evil desire to shine makes us want to appear other than we are.
If man had his way, the plan of redemption would be an endless and bloody conflict. In reality, salvation was bought not by Jesus fist, but by His nail-pierced hands; not by muscle but by love; not by vengeance but by forgiveness; not by force but by sacrifice. Jesus Christ our Lord surrendered in order that He might win; He destroyed His enemies by dying for them and conquered death by allowing death to conquer Him.