It's only been a month. Your glider is probably still afraid of you. It can take many months for a glider to bond to you and trust you. Most gliders don't like to be picked up, imagine what your hands look like to him. It looks like a bird claw. Make sure you aren't wearing any type of perfume or scented soap. He might think that you smell like food. Try to push him away when he tries to bite. Also look into getting him a friend he may be frustrated and stressed out from not having a buddy.