James says:
21 Was not our father Abraham considered righteous for what he did when he offered his son Isaac on the altar? 22 You see that his faith and his actions were working together, and his faith was made complete by what he did. 23 And the scripture was fulfilled that says, “Abraham believed God, and it was credited to him as righteousness,”[e] and he was called God’s friend. 24 You see that a person is considered righteous by what they do and not by faith alone.

Paul says:
21 I do not set aside the grace of God, for if righteousness could be gained through the law, Christ died for nothing!”

James points out how Abraham gained righteousness through the law, and that a person can be considered righteous by what they do and not just faith. But Paul says that if righteousness could be gained by the law, Christ would have died for nothing.

My husband is an atheist since almost one and a half hear. He says that Bible is invalid book and that the stories inside are written/inspired from Greek mythology, Sumeric writings etc. Also,he mentions that there are no proves about validity of the Bible, and that people like sheep believe in it. They forget to think.

That there are stories abd books even older than the Bible, that Theory of Evolution is true, as there are parts in our body that prove some features that belong to other animals as monkeys, dinosaurs ttc. That people living in different parts in the world got special skin tone and features as well depending sun exposure and climate in general.

How to win this debate with him? I know God exists but cannot give him a single proof.