I wouldn't use the offline page as your normal method for not letting any unregistered users into the site. You could, but I wouldn't.
Better to change all your "member only" areas to be for "registered" access users only and just have your home page with a login form published to it with guest access. You would only normally have recaptcha on a user registration screen, and since you are not going to have that I would not add one to the login, no.
Regards, Mark.
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See screenshot - turn off front-end user registration in user manager options.
Regards, Mark.
Please search forums before posting. Please make sure your post includes the version of the CMS you are using and a link to the problem. Annotations on screenshots can also be helpful to explain problems/goals. Please use the "secure" tab for confidential information.