John 3:16
Being spiritually alive is no guarantee of fidelity. Ask Adam. Faith is a fruit, a work of the Spirit through the indwelling word of God. Believing is an act of our will.
I kid not. Ask the Israelite crowd that exited Egypt. The Exodus was an act of grace on God's part, all received that grace, only Joshua and Caleb responded positively the rest went negative.
This is why God can judge a man righteously and without any partiality because two men can receive the same grace yet one responds by believing the other responds by rejecting.
Try thinking beyond your dogma.
Going by your logic, it won't be possible for God to judge the fallen angels righteously since God never offered them grace, which means they will never have the opportunity to respond to it.