IMO, the stuff you have searched up on the internet is complete rubbish. IMO, anyone interested in truth needs to start by reading a good translation of the Bible for themselves. The internal integrity of scripture will quickly dispel these unfounded claims about the Bible.
Jesus did not write the words of scripture because he is [IMO, and according to the NT scriptures] the Spirit of prophecy, the Word of God. For the Word of God to be believed, there need to be human intermediaries recording God's works and commandments. In the Bible (unlike the Qur'an) there are numerous prophets, each providing the SAME CONSISTENT MESSAGE. Forty or more prophets are said to have written the words of scripture, and each book is quoted by other prophets. This makes the Bible a tapestry which, in the words of Jesus, 'cannot be broken'.
Another little thing worth noting is the evidence of the early Church. When the apostles were first preaching the 'good news' there was no need for the written Gospel. The evidence that Jesus had been resurrected from the dead came in the form of Holy Spirit baptism. All the early Christians expected to experience this baptism, and it was a promise from Jesus that they would. Hence, the Holy Spirit becomes evidence of the risen Lord, and a fulfilment of his promise to the Church. It is only as the work of the apostles comes to an end that the need for a complete scripture becomes apparent. I believe, and am happy to make the case, that many of these written records were in existence much earlier than some scholars think. For a start, the evidence points to the death of Paul in about 64 CE, and he already knew things that were recorded in the Gospels (such as events of the Last Supper - 1 Corinthians 11).
'But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me:
And ye also shall bear witness, because ye have been with me from the beginning.' [John 15:26,27]