You can either doubt, or trust that when Jesus said, "sanctify them in thy truth, Thy Word is truth," either he's right, or the doubters are. His credentials seem superior, but you can choose your group to follow.
Read about, pray, then ponder. Depending on your religion, it may come in different ways. In James it says if any of you lack wisdom, let him ask of god, which givith liberally, and upbraideth not. (quoting from memory, I think it's St. James, 1: 13, could be remembering wrong). Also, you have to ask with a sincere heart. Also, it may not be knowing, since many ancient prophets just believed in him, and since they believed in him, they saw miricales, after which their believe changed into knowing. Miracles don't create faith, but faith creates miracles.
I really don't know. I think that some random person wrote the bible for popularity and money or whatever.I mean how would any writing survive all those years? Think about all the hurricanes,tornadoes,volcanoes,floods,and earthquakes that could have destroyed any writing or anything in general.Since God supposedly wrote the ten commandments, how could we be able to read or find any writing that ever existed in that time.So I think the Bible is not proof of anything,simply just a made up story.
The same way you know the Qur'an is true, or the Book of Mormon, or even the Iliad for that matter. You don't know until you find actual corroborating evidence. (which is quite rare for all those books)
The Bible has transformed a countless number of lives. Yet many people allow the views of others who have never seriously studied the Bible to shape their own opinions. Each of us needs study it for ourselves. Put it to the test. Live by the Bible's precepts and experience for yourself the dynamic and transforming power of this amazing Book. Apply its teachings on forgiveness and see how it can mend a broken relationship. Apply its principles of stewardship and watch your financial situation improve. Apply its teaching on faith and feel a calming presence in your heart even as you navigate through a difficult trial in your life. The Bible works. There is a reason Christians in various countries around the world risk their lives daily to expose others to the life-giving truth of this remarkable Book.gotquestions.org
No other book has been scrutinized like the Bible; yet it had continued to stand; archaeology supporting it; history from other sources verifying it; fulfilled prophecy confirming it. Where other literature has a handful of manuscripts many hundreds of years after the event; the Bible has over 5500 manuscripts within 100-200 years of the events. The most credible commendation comes from Jesus Christ Himself. I hope you will read it with a sincere heart and a critical mind. Ultimately, you will have to decide if you believe Him, not me, not anyone else.
I will repeat for others what I put in a comment: The fact that the Bible has never been able to be disproved in all its 1000's of years to me says that it is true. Along with the fact that as you read it, you can see for yourself all the things it tells you would come to pass have been happening. There's no way to explain the things of God because we can only physically see with the eyes of man. When you look with your spiritual eyes, the truth is opened in a whole new way, and you can never really doubt again.