First, if God wasn't real then atheist would not exist.
Second, there are no contradictions in the Bible unless you take verse out of context or apply then with another verse that is not in the same context. Most "contradictions" are discovered by people who haven't even read the Bible and do not read the full message l, they pick at small pieces and dissect them and present them in a form and make it look like it contradicts something when it actually doesn't.
Third, the reason they attack it is because God does in fact exist, they are not atheist because of non belief or because they aren't sure. They are atheist because they are against God. They do not like his laws because they find glory in themselves and not God.
The fool hath said in his heart, There is no God. They are corrupt, they have done abominable works, there is none that doeth good. 2 The LORD looked down from heaven upon the children of men, to see if there were any that did understand, and seek God. 3 They are all gone aside, they are all together become filthy: there is none that doeth good, no, not one. 4 Have all the workers of iniquity no knowledge? who eat up my people as they eat bread, and call not upon the LORD. 5 There were they in great fear: for God is in the generation of the righteous. 6 Ye have shamed the counsel of the poor, because the LORD is his refuge. 7 Oh that the salvation of Israel were come out of Zion! when the LORD bringeth back the captivity of his people, Jacob shall rejoice, and Israel shall be glad
BTW TO THE DERP THAT SAYS THE BIBLE SAYS THE EARTH IS FLAT YOUR WRONG IT SAYS IT IS ROUND 4000 YEARS BEFORE SCIENTISTS DISCOVERED IT WAS ROUND. ALL OTHER CULTURES BELIEVED IT WAS CARRIED ON AN ANIMALS BACK OR THAT IT WAS FLAT. NO WONDER YOU FOLLOW A FALSE RELIGION, YOU HAVENT EVEN READ THE TRUE ONE! ISLAM IS FALSE AND I CAN PROVIDE YOU A THOUSAND REASONS WHY.