Typically this is a Christian argument used against Islam - but I’m actually curious if this is seen as a valid argument from a secular point of view? (Even if it’s not the “best”)
Because essentially it’s “your holy book contradicts the holy book it claims to be endorsed by”, which personally I think I can see working on a secular level, even if you don’t actually believe in the Bible either.
spoiler
! Also, full disclosure: Yes, I am a Christian. !<
Islam states that the Quran was literally dictated by an angel and is the direct word of God.
The Quran also states that the Bible was written by human fans of Jesus, who was loved so much his true message about God was forgotten.
I don’t think this argument does much to convince anyhow who isn’t already of the mind that “the Bible is the sole source of truth in reality”, which obviously the majority of the world isn’t, (and probably all Muslims).