Teen Gothic

I've noticed in the past a lot of mentions religious deities and terms like God, Lord, and Jesus within Post-Punk and Gothic songs. A few memorable ones include;

"I know that God lives in everybody's soul and the only Devil in your world lives in the human heart" -Good Morning Beautiful by The The

"Is my creator a God or a man? (Yes, yours too)" -Monkeyland by The Chameleons

"Moving along in our God-given ways safety is sat by the fire" -Passover by Joy Division

"Jesus christ, i am bleached by the heat but i feel fine in my filthy skin" -Bleach by Lowlife

I also notice that religion symbols like the cross can be within gothic fashion as well. Aside from artistic expression, why do you think religious symbols and language are used so often in the goth and post-punk scenes?