This is more than a philosophical question, this is a spiritual and physical question that goes back to the entire Adamic race’s fall from grace. You see when the archangel Lucifer and his cohort of 1/3 of total angels in heaven rebelled against God and fell, there was no rescue plan or redemption for him. But for human race when Adam fell, God immediately put into place a redemptive plan starting with an animal slain and its skin used to cloth Adam and Eve.

Genesis 3: ²¹ The Lord God made garments of skin for Adam and his wife and clothed them.

And that redemptive plan ran through the entire Old Testament through the covenant with Abraham to bless him and multiply his descendants and to take the nations, to Moses’ covenant with the chosen nation Israel, to David of Israel, and finally all the promises of God for global salvation and his global eternal dominance was finally established when Jesus died on the cross and resurrected three days later.

Jesus’ resurrection defeated the power and curse of death. He saved the entire Adamic race or mankind for those who put their faith in Christ. That is major breakthrough for redemptive act of God for mankind. The first Adam fell, then the second Adam came and succeeded to save the entire race.

Why did the bible calls Jesus as the second Adam?

Romans 5: ¹⁷ For if, by the trespass of the one man, death reigned through that one man, how much more will those who receive God’s abundant provision of grace and of the gift of righteousness reign in life through the one man, Jesus Christ!

Through one man, Adam, death reigned thru that man to the entire human race, and similarly through one man, Jesus Christ, we all received God’s grace and the gift of righteousness.

But why does the Savior have to be a Man?

Hebrews 2: ¹³ And again, “I will put my trust in him.”  And again he says, “Here am I, and the children God has given me.”  ¹⁴ Since the children have flesh and blood, he too shared in their humanity so that by his death he might break the power of him who holds the power of death—that is, the devil—¹⁵ and free those who all their lives were held in slavery by their fear of death. ¹⁶ For surely it is not angels he helps, but Abraham’s descendants. ¹⁷ For this reason he had to be made like them, fully human in every way, in order that he might become a merciful and faithful high priest in service to God, and that he might make atonement for the sins of the people. ¹⁸ Because he himself suffered when he was tempted, he is able to help those who are being tempted.

Jesus calls us, those who followed him as his children

Jesus called us as the children God has given him. He must be an earthly flesh person to become our Father. He can’t be Spirt, and we be the flesh. Then, since we have flesh and blood, he must share in our flesh and blood, so that by his death (remember God can’t die), he might break the power of Satan who holds the power of death. You see the rationale here? Because we are flesh and blood, in order to break the power of death over flesh and blood, he needs to become flesh and blood to break the power of Satan who holds the power of death. But why? Can’t God break the power of Satan who holds the power of death directly from his heavenly throne?

The first answer is that he is saving flesh and blood, and he must become like flesh and blood. V17 says for this reason, he had to be made like them, fully human in every way, in order to become a merciful and faithful high priest to God on our behalf, and that make atonements for the sins of us.

Jesus gained empathy for humans through his experience of temptations and suffering in faithfulness to God.

This is important to understand. Before Jesus incarnated into the world and became a human, He would not be able to have the complete empathy as he did in his earthly life after being tempted and all that. Because God cannot be tempted. Jesus could not be tempted before his incarnation to the world. Therefore for him to fully empathize with humans’ sufferings and temptations, he must become a man to experience temptations (40 days in the wilderness, and also the struggle in Garden Gethsemane when sweated blood). That’s crucial to understand.

God is omnipotent so why can’t he just save mankind?

People usually think God can do anything if he wants to right? Theologically its right but its also within constraint. Example, God cannot sin. God cannot be unjust. He cannot be deceitful. He cannot bypass his attribute of holiness, and because of that even though He is a God of love and faithfulness, He still needs to send men and women who reject Christ to hell. Modern world cannot understand that, and ask why would a loving God do that? But they forgot to insert the words, a holy God! He is both holy and loving. These two can’t meet on our daily logic until they meet on the cross of Jesus. It’s there on the cross, love and holiness meets. Holiness means wrath against those who break his laws. It’s like a judge who loves his son, but his son committed murder and was to be sentenced to death, he even though loves his son much, he is supposed also to uphold the law. The law of God comes from his attributes, and one of them is holiness, and hence wrath against all ungodliness. His wrath is poured out towards all those who walked away from Him, rebelled against Him, and hence sentenced to eternal condemnation. But Jesus came into this world, and he drank all the wrath of God His father in order that He may break the power of Satan who holds the power of death.

He cannot override one attribute of him to fulfill the other attribute. They must all be true simultaneously, or else He ceases to be God.