It simply means that there are people who beleive parts of the Bible speak of events that actually occured.
Actually, everyone believes that parts of the Bible speak of events that actually occurred. (The Bible talks about some things that we also know about from non-biblical sources.)
It would be better to say: Some people believe that there are so-far-uncorroborated parts of the Bible that actually occurred.
Can you isolate the experiment from their expectations?
Yes, you can, though I don't know if this study did so.
Make it more blind. Have volunteers (who can't see the images) classify the infants' reactions to the images.
Whoops, hold on. I just RTFA. They're not evaluating based on the infants' facial expressions--they're evaluating based on how long the infants looked at each image. That's objective--hard to see how the scientists' expectations would be affecting the data. Mind you, "more time looking==more scared" isn't obviously valid, but the difference in times between the tests is still significant. You could question whether the girls are learning fear vs something else, but the test still seems to show that the girls are being trained by the images while the boys aren't.
We is plural, it implies him and at least someone else.
Which still includes him in the dying & whatnot.
2) An expansion of a definition of sin based on the only "principals" known at the time (i.e. old testament's 10 commandments).
Ah, that's the part that makes me go "say what"?
The Old Testament law contains a lot more than the 10 Commandments, so they're not the "only principles known at the time". They have some importance, but Moses came down from the mountain with a lot more than that. And for that matter, the prophets say a lot throughout the OT.
Which is why you can't immediately claim that he's actually expanding anything, just because it's not in the 10 Commandments. You have to know what kind of things the OT teaches before you decide that. And even if this particular application hadn't been made in any Hebrew Scripture, that doesn't mean the basis for the application is new.
Remember to say hello to your bank teller.