Biology, I don’t know that there’s a difference between a min and an apikorus.
There probably is a difference between taking a different halachic viewpoint and the “eino ma’amin” referred to. You can check my source if you wish. I didn’t make it up.
Charlie, where do you find Tosafos and/or the Ramba”m arguing on a Gemara, unless there’s a different Chaza”l on their side?
JMH, Sam is defending the honor of Rishonim. RD called the Baalei Tosafos apikorsim! He deserves all the rebuke, in very strong terms.