Feeling abandoned by the world, a young man drops everything and goes away for a weekend camping trip. Things soon turn ugly when a cult family comes looking for some sacrifices for the unseen howling creatures lurking in the nearby woods.

Leaning towards:
“An adrift young man must fight to survive a cannibalistic cult on a nightmare camping trip from hell”

Add color:
Who is this young man?
I took liberties with your cult – what kind of cult are you referring to?
What are these howling creatures? Is this a monster/werewolf flic? If so, focus your logline around this.

Hope you find this constructive, keep going!