"You are barely even home." Okay
"You barely even come home." This one should be "you've barely even come home" or "you barely came home."
"God knows you come home from wherever you are." This one could be correct if speaking about the present. It could also be "god knows you're coming home from wherever you are," but if the person is already home, "come" should be "came."
I hope my answers help. Please let me know if you still have questions.