Answer:
I am an activity involving pins flying in the air.
I shift around though always slowly. I never move more than a few inches at a time. A large movement by me can kill many people. I am huge yet unseen by humans.
Oh lord! I am not worthy! I bend my limbs to the ground. I cry yet without a sound. Let me drink of waters deep. And in silence I will weep.
I build up castles. I tear down mountains. I make some men blind, but I help others to see. What am I?
I am a popular afterlife location to send evil people
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.