I cannot say this is the best approach, but I incline to flat out accuse the Bible god of being a totally invented propagandistic fraud and especially devoid of morality.  You can’t order the genocide of whole tribes and theft of lands and virgin-stock, and have the slightest credible claim to morality, especially while claiming to own the universe.  There’s been extensive debate on these lines on my own page where I’ve had some wild accusations levelled against me.  I’m leaving them up, as they hang themselves.  BTW I am actually friendly with many believers as I share their views on abortion, albeit for secular reasons rather than their contradictory reasons.