(I change the links to the Scripture references from their original source.) While there are many reasons to reject the Apocrypha as on par with Scripture, the main reason is the testimony of Christ. Here for instance is an article from the BLUE LETTER BIBLE by Don Stewart (a co-author on many works with Josh McDowell) giving 27-reasons to reject the Apocrypha as equal to Scripture… the most important point being his #27:
27. JESUS’ TESTIMONY IS DEFINITIVE
It is clear that in the first century the Old Testament was complete. Jesus put His stamp of approval on the books of the Hebrew Old Testament but said nothing concerning the Apocrypha. However, He did say that the Scriptures were the authoritative Word of God and they could not be broken. Any adding to that which God has revealed is denounced in the strongest of terms. Jesus asked the religious leaders a penetrating question.
Why do you break the command of God for the sake of your tradition? (Matthew 15:3).
Jesus’ And The Extent Of The Old Testament
A statement by Jesus seemingly gives His belief in the extent of the Old Testament.
Therefore I send you prophets, sages, and scribes, some of whom you will kill and crucify, and some you will flog in your synagogues and pursue from town to town, so that upon you may come all the righteous blood shed on earth, from the blood of righteous Abel to the blood of Zechariah son of Barachiah, whom you murdered between the sanctuary and the altar. Truly I tell you, all this will come upon this generation (Matthew 23:34-36).
He mentions Abel and Zechariah as the first and last murder messengers of God that were murdered. Abel’s murder is mentioned in Genesis while Zechariah’s was in 2 Chronicles – the last Old Testament book in the Hebrew canonical order. The fact that these two are specifically mentioned is particularly significant. There other murders of God’s messengers recorded in the Apocrypha. Jesus does not mention them. This strongly suggests He did not consider the books of the Apocrypha as part of Old Testament Scripture as with the books from Genesis to 2 Chronicles.
THERE WAS MORE TESTIMONY FROM JESUS
Jesus gave further testimony of the extent of the Old Testament canon in the day of His resurrection. He said.
How foolish you are, and how slow of heart to believe all that the prophets have spoken! . . . And beginning with Moses and all the Prophets, he explained to them what was said in all the Scriptures concerning himself (Luke 24:25,27).
Note Jesus’ emphasis on “all that the prophets had spoken.” Later He explained the extent of “all that the prophets had said.”
He said to them, “This is what I told you while I was still with you: Everything must be fulfilled that is written about me in the Law of Moses, the Prophets and the Psalms” (Luke 24:44).
This is a reference to the threefold division of the Hebrew Scripture. They constitute “all that the prophets said.” There is no reference to the Apocrypha. It would not have been part of the threefold division of the Old Testament.
So, even if an early church father thought the Apocrypha should be included as Holy Scripture, he would be wrong (see also CARM). STAND TO REASON basis their article on the matter on this point by Jesus:
Should the Bible include the Apocrypha? Here is where I think Jesus can help. Specifically, I believe Jesus’ words lead us to the conclusion that the Apocrypha is not Scripture.
During one of His heated discussions with the Pharisees and the lawyers, Jesus says,
Therefore also the Wisdom of God said, “I will send them prophets and apostles, some of whom they will kill and persecute,’ so that the blood of all the prophets, shed from the foundation of the world, may be charged against this generation, from the blood of Abel to the blood of Zechariah, who perished between the altar and the sanctuary. Yes, I tell you, it will be required of this generation.” Woe to you lawyers! For you have taken away the key of knowledge. You did not enter yourselves, and you hindered those who were entering. (Luke 11:49–51)
First, notice that Jesus mentions the blood of all the prophets. He’s not talking about some of the prophets. He’s talking about the blood of all the prophets since that foundation of the world. Next, Jesus limits who He includes with “all the prophets.” He gives us some bookends for identifying these prophets. In verse 50, Jesus says, “…from the blood of Abel to the blood of Zechariah.”
Abel is the very first prophet to die for his faith. The death of Abel is recorded in Genesis—the first book of the Jewish Scriptures. Jesus also cites the death of Zechariah as the last prophet to die. However, this isn’t right. Zechariah isn’t the last prophet to die. Chronologically speaking, Uriah—the son of Shemaiah—is the last prophet killed. You can read about his death in Jeremiah 26:20–23.
So why does Jesus list Zechariah as the last prophet to die? The reason is crucial to why we shouldn’t accept the Apocrypha as Scripture. Jesus chose Abel first and Zachariah last because they were the first and last prophets martyred in the Jewish Scriptures. The Jews of Jesus’ day would have known that Zechariah’s death is recorded in Chronicles—the last book of the Jewish Scriptures. It reads,
Then the Spirit of God clothed Zechariah the son of Jehoiada the priest, and he stood above the people, and said to them, “Thus says God, ‘Why do you break the commandments of the Lord, so that you cannot prosper? Because you have forsaken the Lord, he has forsaken you.’” But they conspired against him, and by command of the king they stoned him with stones in the court of the house of the Lord. (2 Chronicles 24:20–21)
Therefore, Jesus limits “all the prophets” to the Jewish Scriptures—from Genesis to Chronicles. It was the prophets contained in the Jewish Scriptures, and no others, who were responsible for communicating God’s word until the time of Christ. The author of Hebrews writes, “Long ago, at many times and in many ways, God spoke to our fathers by the prophets, but in these last days He has spoken to us by his Son, whom He appointed the heir of all things, through whom also He created the world” (Hebrews 1:1–2)….
Oh, BTW, I am a big fan of that guy, Jesus.