That's true enough. But they were cut away because they did not have faith, and you are where you are because you do have faith. So don't be proud, but be afraid.
My dear friends, you always obeyed when I was with you. Now that I am away, you should obey even more. So work with fear and trembling to discover what it really means to be saved.
You say that God is your Father, but God doesn't have favorites! He judges all people by what they do. So you must honor God while you live as strangers here on earth.