"Biblical Basis" questions are inherently problematic. Sometimes they work alright, but usually they are less well suited to the job than people want to think. It is a hack that gets employed because people can't think through clearly what they are actually trying to get at.
To complicate matters, the few times it really should work as a scope is the same few times when there are conflicting interpretation(s), and the scope of the question really becomes about those interpretations, not any particular passage.
I suggest you spend a bit of time and work out what you are really trying to come away having learned about Christianity.
In the case of your example question I suspect you are trying to get at something more along the lines of "Was the reason for circumcision in the OT scientific/health related or was it ceremonial?" or perhaps "Is there any symbolic conflict with getting circumcised for medical reasons according to a view that holds circumcision as an obsolete ceremonial sign?"