Yes, Paul is addressing Christians and finishes that way too. In verse 35, he starts talking about the Resurrected body of all, both saved and unsaved.
I Cor 15
35 But someone may ask, “How are the dead raised?
What kind of body will they have?” 36 These are stupid questions. When you plant something, it must die in the ground before it can live and grow. 37 And when you plant something, what you plant does not have the same “body” that it will have later. What you plant is only a seed, maybe wheat or something else. 38 But God gives it the body that he has planned for it, and he gives each kind of seed its own body. 39 All things made of flesh are not the same: People have one kind of flesh, animals have another, birds have another, and fish have yet another kind. 40 Also there are heavenly bodies and earthly bodies. But the beauty of the heavenly bodies is one kind, and the beauty of the earthly bodies is another. 41 The sun has one kind of beauty, the moon has another kind, and the stars have another. And each star is different in its beauty.
42
It will be the same when those who have died are raised to life. The body that is “planted” in the grave will ruin and decay, but it will be raised to a life that cannot be destroyed. 43 When the body is “planted,” it is without honor. But when it is raised, it will be great and glorious. When the body is “planted,” it is weak. But when it is raised, it will be full of power. 44 The body that is “planted” is a physical body. When it is raised, it will be a spiritual body.
There is a physical body. So there is also a spiritual body. 45 As the Scriptures say, “The first man, Adam, became a living person.[
d]”[
e] But the last Adam[
f] is a life-giving spirit. 46 The spiritual man did not come first. It was the physical man that came first; then came the spiritual. 47 The first man came from the dust of the earth. The second man came from heaven. 48 All people belong to the earth. They are like that first man of earth. But those who belong to heaven are like that man of heaven. 49 We were made like that man of earth, so we will also be made like that man of heaven.
50 I tell you this, brothers and sisters:
Our bodies of flesh and blood cannot have a part in God’s kingdom. Something that will ruin cannot have a part in something that never ruins. 51 But listen, I tell you this secret: We will not all die, but we will all be changed. 52 It will only take the time of a second. We will be changed as quickly as an eye blinks. This will happen when the last trumpet blows. The trumpet will blow and those who have died will be raised to live forever. And we will all be changed. 53 This body that ruins must clothe itself with something that will never ruin. And this body that dies must clothe itself with something that will never die. 54 So this body that ruins will clothe itself with that which never ruins. And this body that dies will clothe itself with that which never dies. When this happens, the Scriptures will be made true:
“Death is swallowed in victory.”
55 “O death, where is your victory?
Where is your power to hurt?”
56 Death’s power to hurt is sin, and the power of sin is the law. 57 But we thank God who gives us the victory through our Lord Jesus Christ!
58 So, my dear brothers and sisters, stand strong. Don’t let anything change you. Always give yourselves fully to the work of the Lord. You know that your work in the Lord is never wasted.