In a video I have heard a scholar say that if a person whether a man or a woman, only prays namaz during Ramadan but does not pray the rest of the year is a Kafir. Is it true that if a person does not offer namaz the whole year but only prays during the month of Ramadan is a Kafir?
بسم الله الرحمن الرحيم
It is major sin to miss fardh salah. Though, it is severe sin to miss the salah but it does not make a man kafir. However, missing the salah (not offering) is the practice of kafir. That is why Hadith says: whoever leaves salah intentionally he committed kufr.
من ترك الصلاة متعمدا فقد كفر .
Allah knows Best!
Darul Uloom Deoband