"Therefore consider the goodness and severity of God: on those who fell, severity; but towards you, goodness, if you continue in His goodness. Otherwise you also will be cut off." Romans 11.22Modern Christians consider God's love, kindness and mercy. But they forget about His justice and severity.
However, if He did not spare the fallen angels, or mankind during the time of Noah, or the inhabitants of Sodom and Gomorrah, do you think that He has changed and will spare those who have fallen and didn't repent.