Jesus told many parables about people being sheep and vines and the like. However, the topic becomes altogether more sinister when you look into it a little more deeply. A shepherd does, on the whole, look after his sheep. However, no motivation is pure and this is not done out of pure altruism. The shepherd looks after his sheep so that they breed and grow so he can kill and eat them. Or sell them, or parts of them. There are a lot of passages likening us to dinner and it starts to feel like God has dinner on the mind.
If God was your shepherd, would you be looking to escape the farm to freedom?
If you don't, just look at Revelation to see what happens. He actually eats you. Don't say you weren't warned.