Praying for you to have the faith to know that the Almighty is the only true Diety. No matter how obvious things may be, no matter how much research we may do, the evil one is very good at deceiving and confusing us.
As for how I know that He is Who the Bible says He is, one reason is because the Bible holds up to history, archaeology, science and fulfilled prophecy. There is absolutely nothing else like it in the world. What is says about how the world came to be is verified if one looks outside the matrix mind set of this society and searches for the true science, where the real data and evidence are.
The Bible was apparently started by Adam. What was written in the first 5 books was compiled by Moses and various prophets and saints contributed to the other books in the "Old" Testament. The "New" Testament was written by Messiah's followers. It was compiled at the Nicene Council by varioius scholars. (
How do we know that the "Old" Testament that we have is accurate and not, as main stream media and culture would have you to believe, "just copies of copies of copies changing from one language to another." That is a very easy Q to answer. The French don't go to the English to translate, or vice versa. They all use the original Hebrew and Greek texts and translate into their own languatge. Also, in the late 1940s a Bedouin found some old scrolls in some caves. This was the greatest archaeological find in hisotyr. In those, and other scrolls found later, there is at least a portion, sometimes entire works, from every book in the "Old" Testament except for Esther.
When those books, written before the time of Messiah, were compared to what was being taught from Bibles in Synagogues and Churches, how different were they? There was virually no difference at all! This is because the ancient scribes were "fanatic" about getting the Torah/Bible right when copying it. If they made one slip of the pen then the entire scroll was buried in the ground!
As far as the "New Testament" is concerned, it is constantly being verified by archaeology and history and also by numerous writings from it found around the world.
For ex. people used to say, "There was no Pilate! History doesn't show any such person!" But then they found a stone for a building naming him as the administrator. Physcians have also stated that the descriptioin of the crucifixion matches what one would expect. These kinds of things happen all the time.
There is a great video on the Shroud of Turin. I will give you the link and you can make up your mind if you think it authentic or not. One has to ask, if it is a medievel painting as some would have us to believe, why it has actual blood on it, why it makes not only a negative impression (like a photograph) but a holographic impression. No artist in those days could create those effects and really we can't either.
In addition they have discoverd from faint images that the body has 1st century coins from Jerusalem over its eyes and that flowers were placed around it that are found only in Jerusalem. There is much more that can't be explained except, mho, by the miracle of the Resurrection. But decide for yourself. (You have to scroll down to "The Fabric of Time.)
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It is good that you ask Qs. My personal experience has been that the more Qs I researched, the more my faith grew and this has been the case for so many years.
I hope you will not feel that because you are so young that you cannot analyze and decide things for yourself. Much of what there is to learn is based on plain common sense - something I personally feel is so lacking in the mental mind set of today.
Praying you will be led into all truth.