I'm not sure as to the extent he 'emptied' himself of his deity (Philippians 2) while on earth. But he's back to being God again in heaven.
Philippians 2 doesn't say he emptied himself of his deity. That would be impossible.
Go back to Genesis 1 where God created all plants and animals, "after it's own kind," "whose seed is in itself." That is a fancy way of saying an apple tree seed makes another apple tree, a cow makes another cow, a cat makes another cat, a dog makes another dog, etc. It's nothing but basic biology. As a side note, there is nothing in Genesis that precludes "evolution" within a species. Birds can evolve but they will never become anything other than a bird. Likewise for every other animal. The word "kind" in "after his kind" in the Septuagint translation of Genesis is the word "genos" from which we get our word "genus." So a species may change over time but it will always stay within it's own kind or genus. That of course precludes man coming from a fish, or whatever. But I digress.
Getting back to Jesus' divine nature. Was he not God's son? God miraculously implanted His seed (sperm) in Mary's womb. So what nature would Jesus have had? The same as his Dad's nature. i.e. divine. Can a cow become a non-cow, or a dog a non-dog? Of course not. Like they say, "a leopard can't change his spots." Well, Jesus could no more shed his divine nature than the leopard. What Philippians is really saying is that despite Jesus knowing he had a divine nature, he would never have thought himself to have been God. That is exactly the opposite of what the first Adam did. When presented with the possibility of becoming God (Gen 3:5), he jumped at the chance. We know where that led.
Jesus was fully aware that he was God's only begotten son and thus had a divine nature. He just didn't think that actually made him his own Daddy. Real simple.
By the way, as children of God we also have a divine nature,
2Pet 1:4,
Whereby are given unto us exceeding great and precious promises: that by these ye might be partakers of the divine nature, having escaped the corruption that is in the world through lust.
Can we shed our divinity? Nope! No more than a cow or Jesus. Seed produces offspring of it's own kind. You can't ever become not your earthly father's son. Again, pure biology, which God instituted in the beginning. But our divine nature is way better than the nature we got from our earthly father.
1Pet 1:23,
Being born again, not of corruptible seed, but of incorruptible, by the word of God, which liveth and abideth for ever.
The seed we get from our earthly parent is corruptible. For that we can thank Adam. Once he blew it God said he'd die, and die he did. Unfortunately, we all share from that same corrupted seed Adam passed down. That's why Romans says by one man's disobedience came death and sin. But Romans also says that as by one
man we got sin and death, it is by one
man that we get justification form sin and eternal life (Rom 5:12-19, 1 Cor 15:21). Because of Jesus' perfect obedience to God, we can now be born again of incorruptible seed, which means we have eternal life.
It's amazing that any Christian would have the audacity to think they could make that incorruptible seed corruptible, that they can somehow undo God's work.
Eph 2:10,
For we are his workmanship, created in Christ Jesus unto good works, which God hath before ordained that we should walk in them.
Hello! Jesus is a complete savior. He finished the job (John 19:30). God never expected us to finish our own salvation. In that regard, he had something to say to the Galatians,
Gal 3:1-3,
1 O foolish Galatians, who hath bewitched you, that ye should not obey the truth, before whose eyes Jesus Christ hath been evidently set forth, crucified among you?
2 This only would I learn of you, Received ye the Spirit by the works of the law, or by the hearing of faith?
3 Are ye so foolish? having begun in the Spirit, are ye now made perfect by the flesh?
I always ask any Christian who thinks they can loose there salvation by sinning exactly how many sins it takes to do that. So far, nobody's come up with an answer. While we do have a divine nature, we also have our same old dead flesh nature. God's workmanship had nothing to do with our flesh. He didn't make it one wit better. It was dead before we got born again and it'll be dead until it's really dead, i.e. 6 feet under the ground. We become more Christlike by looking to him, not looking to our own flesh. God tells us over and over to put on the "new" man. That is the new creation God put withing every born again believer. That is where our righteousness is to be found. Forget the flesh! Set your thoughts on things above, not on things (e.g. your flesh) of the earth.
But if looking to Christ is the key, how far do you think you can get if you don't understand the most basic aspects of his character? I can't emphasize enough that by making him God you will miss the bus altogether. At least in this life. Since you've confessed him as Lord and believe God raised him from the dead (Rom 10:9-10), you got born again by incorruptible seed. That is your reserved seat in the new earth regardless of what you believe about Jesus' nature. Let's face it, anyone can do Romans 10:9-10, whether or not they subsequently think Jesus is God or not. I'm often told I'm going to hell because I don't believer Jesus is God (I'm not saying you said that), but I can't think of a more unloving thing to say to a brother or sister in Christ. I just chalk it up to an ignorance of God's plan for redemption. It's just what they've been taught. But I'd never think that about a trinitarian. I love the many trinitarian brothers and sisters as I do the few non-trinitarians. Pretty sure that's what Jesus told us to do somewhere in 1 John.
Take care.