God is at work in the lives of every soul in the world, whether they believe in Him on not, even the most God hating atheist in the world is being watched, tested, and changed on a daily basis, so that one day in that non-believer's future, they will get down on their knees and give themselves to God, why? because Jesus is Lord:
Romans 8:29. For whom he did foreknow, he also did predestinate to be conformed to the image of his Son, that he might be the firstborn among many brethren.
That is the purpose of God, God foreknows every soul in the world, and He has predestined them to be conformed, that is remade, into perfect spiritual images of Jesus. He is hard at work on everyone, non-believers, Muslims, Buddhists, everybody, to slowly, over time, remake them into perfect spiritual images of Jesus. there will be some who will not be converted, and for them, the second death awaits, but god will not give up until it becomes clear that their soul cannot be remade into the gold He wants in His Kingdom.
John 1:12
But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name:
So YES, Jesus is Lord of all !