You can not see wind either my friend, but you can observe the effects of wind all around you. Though I do not see God, I can observe everything He has made all around me. The Ten Commandments were written by God Himself. As far as the earth being flat, the Bible records that it was round some 1000 years before the birth of Christ. (Isaiah 40:22).
The reason why the Bible can be trusted as the true words from God is because of the prophecies recorded in it that have come true. There were over 300 of them that came true just by the birth of Christ alone. The mathematical possibility of that happening would be like covering the state of Texas with quarters, painting one side red on ONE quarter, and then being able to pick that quarter up the first time, and that is for only one prophecy. If we discount the Bible, and what it says, then we might as well discount every history book ever written, because the Bible passes the most scrupulous test of any history book ever recorded.
The book of Isaiah contains many prophecies concerning the Messiah. The book of Isaiah was written some 1000 years before the birth of Christ. Skeptics like yourself use to say that the book of Isaiah must have been written after the birth of Christ, but then came the Dead Sea scrolls, in which we have a complete copy of the book of Isaiah, and when compared to the copy we have in our Bible, it was right on.
Here are just a few:
Micah 5:2 -Predicted that the Messiah would be born in Bethlehem.
Isaiah 53: -Predicted that the Messiah would suffer for the sins of His people.
Isaiah 53:
Who hath believed our report? And to whom is the arm of the LORD revealed? For he shall grow up before him as a tender plant, and as a root out of a dry ground: he hath no form nor comeliness; and when we shall see him, there is no beauty that we should desire him.
He is despised and rejected of men; a man of sorrows, and acquainted with grief: and we hid as it were our faces from him; he was despised, and we esteemed him not. Surely he hath borne our griefs, and carried our sorrows: yet we did esteem him stricken, smitten of God, and afflicted. But he was wounded for our transgressions, he was bruised for our iniquities: the chastisement of our peace was upon him; and with his stripes we are healed. All we like sheep have gone astray; we have turned every one to his own way; and the LORD hath laid on him the iniquity of us all.
He was oppressed, and he was afflicted, yet he opened not his mouth: he is brought as a lamb to the slaughter, and as a sheep before her shearers is dumb, so he openeth not his mouth. He was taken from prison and from judgment: and who shall declare his generation? for he was cut off out of the land of the living: for the transgression of my people was he stricken.
And he made his grave with the wicked, and with the rich in his death; because he had done no violence, neither was any deceit in his mouth. Yet it pleased the LORD to bruise him; he hath put him to grief: when thou shalt make his soul an offering for sin, he shall see his seed, he shall prolong his days, and the pleasure of the LORD shall prosper in his hand. He shall see of the travail of his soul, and shall be satisfied: by his knowledge shall my righteous servant justify many; for he shall bear their iniquities. Therefore will I divide him a portion with the great, and he shall divide the spoil with the strong; because he hath poured out his soul unto death: and he was numbered with the transgressors; and he bare the sin of many, and made intercession for the transgressors.
