This ludicrous claim is often repeated by theists. It is an insult and shows the profound ignorance embodied in what in theists passes for thinking.
I have seen the supposed morality as defined by the Bible. It is nothing more than the arbitrary prejudices and bigotry of ancient ignorant misogynists repackaged as divine will.
They arrogantly presumed that their every thought was driven by a supreme being.
Unsurprisingly these men placed women in a submissive role. Genuine enlightened morality shows that this premise cannot be sustained by any rational means.
Likewise the attitude to homosexuality and beating children into submission.
Religion has nothing to contribute to any sense morality.
I mostly agree, but it goes a little deeper.
The real question is, are people essentially moral beings, immoral, or amoral?
If they're immoral then they will do immoral things, regardless of what the bible prescribes.
I think we people are a mixture of the above: there is a touch of immorality in us all, a large slice of amorality, and a sliver of morality. For one thing, it depends on what the perceived consequences are of an immoral act. If it's a penal code, and the perp thinks he won't get caught, then he will act anyway. But if he thinks that God is watching, and God knows all - that might stop him form the immoral act.
You are right when you say that organized religion has often blown it when it comes to identifying what is actually immoral, and the less powerful (usually women, minorities, the poor, etc) are often screwed.
I said we are mostly amoral, because in general we act according to our needs without really considering if it is *right* or *wrong*, (as though there were a real *right* and *wrong*, which is open to debate). But without any penalties or repercussions, people are going to act in their own self interests most of the time.
That's why laws and enforcement are needed, although sometimes they blow that as well. But at least in a democracy, the less powerful have SOME influence on the outcomes of elections, and have swayed them often, if they can get organized and exert their influence - to wit, gay marriage, woman's rights, civil rights for minorities, to name a few.