I think the religion bit was used as a prop during certain times in Sheila's behaviour,particularly when she was being confronted or to get out of a situation. Whichever way you look at it,it was more a cry for help than the fact that she was,herself,religious.
There can be no doubt that Sheila had an interest in religion - at least at certain points of her life.
Dr Ferguson's statements alone make that crystal clear - beyond reasonable debate.
Therefore she would have read the Bible at least occasionally.
Therefore she MIGHT have known the significance of Psalm 51.
I would be surprised if Jeremy knew the significance of Psalm 51- but for all we know he MIGHT have done.
It is more likely that Sheila knew than Jeremy knew - but both are possible.
Almost the only fact i am certain of in this case is that whoever committed the murders beyond doubt knew the significance of Psalm 51 ...
According to the 2002 Appeal Court Judges what happened is this :
The Bible was open at Psalm 51 and had blood on the page ...
The Bible was then closed - they know this because on the facing page was an identical bloodstain - so it MUST have been closed to cause this identical stain on both pages ...
The Bible was then found open on a different page - if you go by the crime scene photos - because in the photos it is clear it was not open at Psalm 51 - there were too many pages on either side of the open section for it to have been left open at Psalm 51 ...
Make of it what you will but if Jeremy or a third party killer had left it open they would have surely left it open on Psalm 51 - after all Psalm 51 is highly relevant to the events of that night ...
Much more likely is that after committing murder Sheila turned to Psalm 51 - that is how the blood got on that particular page - she then either :
a) turned to another page of the Bible
b) closed the Bible and then dropped it - it then fell open at another page ...
The Bible evidence alone therefore points to it being MUCH more likely that Sheila did it ...
I am however obviously aware that there is a lot of other evidence than just the Bible to consider in this case ...
If you don't get 100% what i am saying about the Bible then with the greatest of respect you ARE missing the point - i am not wrong about this in any way shape or form ...
I am happy to answer any questions about this or to try and explain what i mean more clearly if you want - but don't make the mistake of thinking i am wrong about the Bible - because i am not ...