The writing of the bible was completed by the end of the first century. In the 7th Century Mohammad wrote the Quran... in it he stated this:
And we gave [Jesus] the Evangel with its guidance and light, confirmatory of the preceding Law; a guidance and warning to those who fear God .*.*. And to thee we have sent down the Book of the [Koran] with truth, confirmatory of previous Scriptures, and their safeguard.Sura 5:50-52
So over 600 years after the bible was complete, Mohammad gets a revelation confirming to him that the previous scriptures/gospels were from God and had been safeguarded during that time.
So logically, if what you say is true, then any manuscript written AFTER the 7th century should show signs of tampering, right? Because Mohammed would not have had it confirmed if the gospel and injeel were already corrupted. So the corruption must have come after Mohammed time, right?
God's laws are preserved in the scriptures no doubt about this fact but we believe that many verses which is meaningless and irrational have been added by men to the scriptures.
What is the difference between atheism and Christianity regarding God's law.
Christians don't follow God's law because they believe about the inherited sin and that faith on Jesus and his sacrifice is their way for salvation.
Atheists don't follow God's law because they don't believe that God does exist.
For example, Adultery or sexual activities before marriage. is one among others.
Say: "O followers of the Bible! You have no valid ground for your beliefs unless you [truly] observe the Torah and the Gospel, and all that has been bestowed from on high upon you by your Sustainer!" Yet all that has been bestowed from on high upon thee [O Prophet] by thy Sustainer is bound to make many of them yet more stubborn in their overweening arrogance and in their denial of the truth. But sorrow not over people who deny the truth: (5:68)
And lo! there is a party of them who distort the Scripture with their tongues, that ye may think that what they say is from the Scripture, when it is not from the Scripture. And they say: It is from God, when it is not from God and they speak a lie concerning God knowingly. (3:78)
People of the Book, go not beyond the bounds in your religion, and say not as to God but the truth. The Messiah, Jesus son of Mary, was only the Messenger of God, and His Word that He committed to Mary, and a Spirit from Him. So believe in God and His Messengers, and say not, Three. Refrain; better is it for you. God is only One God. Glory be to Him -- That He should have a son! To Him belongs all that is in the heavens and in the earth; God suffices for a guardian. (4:171)