The Apostle John made known that Jesus was full of grace and truth:
John 1:14 And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth.
To doubt, disbelieve, or deny anything that Jesus said or taught is to hold that He was not full of truth but had some error or worse mixed with the truth that He was and taught. If Jesus was not full of truth, then it is impossible to know for sure that He is full of grace and full confidence in His ability to save is made impossible.
When asked a question concerning the subject of divorce, Jesus responded with statements that have profound relevance for our day:
Mat 19:4 And he answered and said unto them, Have ye not read, that he which made them at the beginning made them male and female,
5 And said, For this cause shall a man leave father and mother, and shall cleave to his wife: and they twain shall be one flesh?
6 Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder.
In this teaching, Jesus affirmed that God created mankind as male and female at the beginning. He added that biblical marriage consisting of a man marrying a woman flows directly out of what God did in creating man the way that He did.
Jesus declared that when a man and a woman marry, they become one flesh because God has joined them together as husband and wife. Because God has done so, man is not to separate the couple that God has joined.
A believer who denies that God created mankind as male and female from the beginning has to hold that Jesus was wrong when He said these words. A belief in evolution thus makes impossible the belief that Jesus was full of truth.
If Jesus was wrong when He gave this teaching, He also is not full of grace and trusting in Him for the grace needed to save us is a hopelessly vain endeavor. We must reject any teaching that denies that God created mankind as male and female at the beginning.
Do you believe that Jesus was full of truth?