2) I tell you the truth, unless a kernel of wheat falls to the ground and dies, it remains only a single seed. But if it dies, it produces many seeds. (NIV, John 12:24)
Satan must not be made a martyr, or his martyrdom will produce many more like himself.
Only by Jesus' death will his many disciples receive the power to be missionaries to the world.
The Christan martyrs will cause many more to convert to Christianity.
Our salvation and the growth of God's kingdom are possible only through Jesus' death and resurrection.