Which part of Jesus was god and why, and which part of Jesus was man and why ?
God the Father must reveal to you who Jesus is, or you will not understand.
Mat 16:16 And Simon Peter answered and said, Thou art the Christ, the Son of the living God.
Mat 16:17 And Jesus answered and said unto him, Blessed art thou, Simon Barjona: for flesh and blood hath not revealed it unto thee, but my Father which is in heaven.
Jesus had a human body, but was fully God in the Spirit. God is Spirit.
1 Cor 15:50 Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption.
God the Son, took on the form of a man for our benefit.
Heb 2:14 Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil;
Heb 2:15 And deliver them who through fear of death were all their lifetime subject to bondage.
Heb 2:16 For verily he took not on him the nature of angels; but he took on him the seed of Abraham.
Heb 2:17 Wherefore in all things it behoved him to be made like unto his brethren, that he might be a merciful and faithful high priest in things pertaining to God, to make reconciliation for the sins of the people.
Heb 2:18 For in that he himself hath suffered being tempted, he is able to succour them that are tempted.
Heb 3:1 Wherefore, holy brethren, partakers of the heavenly calling, consider the Apostle and High Priest of our profession, Christ Jesus;
Heb 3:2 Who was faithful to him that appointed him, as also Moses was faithful in all his house.
Heb 3:3 For this man was counted worthy of more glory than Moses, inasmuch as he who hath builded the house hath more honour than the house.
Heb 3:4 For every house is builded by some man; but he that built all things is God.
Heb 3:5 And Moses verily was faithful in all his house, as a servant, for a testimony of those things which were to be spoken after;
Heb 3:6 But Christ as a son over his own house; whose house are we, if we hold fast the confidence and the rejoicing of the hope firm unto the end.
Heb 3:7 Wherefore (as the Holy Ghost saith, To day if ye will hear his voice,
Heb 3:8 Harden not your hearts, as in the provocation, in the day of temptation in the wilderness:
Heb 3:9 When your fathers tempted me, proved me, and saw my works forty years.
Heb 3:10 Wherefore I was grieved with that generation, and said, They do always err in their heart; and they have not known my ways.
Heb 3:11 So I sware in my wrath, They shall not enter into my rest.)
Heb 3:12 Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God.