There is an app called Multi Window Manager that will allow you to use most apps (rather than just the limited list of Samsung apps) in a window. I haven't tried it on my Note but I can open the Tecarta Bible app and Internet in separate windows on my S4 so it ought to work on the Note.
I would say your best bet for a Bible is to use something like Aldiko (e-book reader) and just have several Bibles as books in that. I like the KJV best but I recognise it's not a very faithful translation so I also have an NET (best scholarly version), an NRSV (unfortunately the version we use in our church - I don't like it), Greek NT (to check the odd translation) and an NIV (always curious to see the Protestant perspective).
The Tecarta Bible app is good as a specialist Bible but only the KJV is free.