Can the administers of bitcoin track who is using their service?
There's no administrators.
Do they retain sorting codes and account numbers of money origins and destination?
Bitcoins uses a cryptographic address. You can see the flow of money around the network. That's not stopping somebody using a mixing service to obfuscate the origins of their money, so no.
Which bank provides bitcoin an account to store money which has been used to buy coins?
None. You store then on your computer. You can use a service like mybitcoin to store them for you.
What is to stop, say, an identity thief, moving large amounts of money from my account into bitcoins and collecting them into their account?
Nothing. You lost your identity and the criminal has access to all your emails, passwords, bitcoins, .etc Maybe you can buy insurance to protect yourself. I don't want such a service since I can protect myself more adequately than any bank and am willing to take on the risk for when I do.
What is to stop drug money being laundered through bitcoin?
Nothing.
What is to stop bitcoin being accessed by individuals or organisations under national or international sanctions - like evil regimes or terror groups?
Nothing.
(End of questions)
I don't mean to pry, and I don't imply any threats - I ask totally 100% out of personal curiosity. Just bear in mind that if the answers to those questions aren't what I want to hear, its probably because my work days might become a lot more stressful!
Peace and love x