Hi Tony. Don't try to destroy something before you know if it is true or not. It suggests you have a belief and will then hunt around appropriately friendly sources to support your belief system.
The Bible dates to about 2.5-3,000 B.C. It contains some of the oldest literature and possibly the oldest history of mankind - as a whole. The book of Job and the Penteteuch are amongst the oldest.
Sanskrit Hindu scriptures (possibly) pre-date this from the Indus valley civilisations of India that discuss their own people and especially gods.
There are other cultures beyond the major basic religious traditions that discuss life but I am not sure of their age. Egypian for example, but I'm getting out of my depth at this stage.
If I dare anticipate your reasoning here, I do not think that discovering whether the Judaeo-Christian Bible is the oildest history of man or not will show anything about God, his inspiration, claims or similar and I hope that you will consider this point when responding to this other person who wishes to discuss issues in a friendly way with you. It would seem a shame to end up arguing, going round in pointless circles and always knowing that (s)he is never going to roll over, accept and fully agree with your persuasive, irrefutable reasoned argument and say, you're right, I'm now an atheist. This topic is not a 'deal breaker' when it comes to crucially examining ones faith, but I wish you well.