Can Muhammad Shahidullah and Dr.Kazi Nurul Islam be classified as Muslims due to their Interfaith views?

Question

Can Muhammad Shahidullah and Dr.Kazi Nurul Islam be classified as Muslims due to their Interfaith views? Muḣammad Shahidullah provided a very candid account of his life during an online interfaith program in 2020. He said he'd been brought up in Bangladesh, in a village that was populated by people of different faiths – Muslims, Hindus, Christians – and that this exposure to non-Muslims from a young age had inclined him to interfaith early in life. His family had also been very open to having relations with non-Muslims, with him and his siblings even going to temples to collect sweets during their holiday celebrations. Later on, when he was studying at Dhaka University, Shahīdullāh came under the tutelage of Dr. Kazi Nurul Islam, an interfaith scholar who explained to him the objectives of interfaith dialogue – that it wasn't to do Da'wah and win converts, rather, the purpose was to find common ground with non-Muslims and to appreciate the good that was taught by everyone's respective religion. A man who had apparently studied all the major religions besides his own, Dr. Kazi has espoused multiple heretical beliefs in his writings, like there being no Had for apostasy in Islām, and that anyone who believes in the concept of a divine being, irrespective of their professed religion, is a Muslim (via some linguistic technicality). A description from Georgetown University states, "Dr. Kazi Nurul Islam is a professor and founding chair of the Department of World Religions and Culture at Dhaka University. The Department of World Religions and Culture offers courses in Islam, Buddhism, Christianity, Hinduism, Protestantism, Baha'ism, Shintoism, and Caodism. He was named the ambassador for peace by the Inter-religious and International Federation for World Peace in 2000 and received the Veritas Peace Award in 2003. He has authored several books including, A Critique of Sankara's Philosophy of Appearance (1988). Dr. Islam received a Fulbright grant to study religious pluralism at California University at Santa Barbara in the US. He holds a Ph.D. in Hinduism from Banaras Hindu University in India." Although I'm unaware if Shahīdullāh holds the exact same views as Dr. Kazi, it's safe to say that he imbibed much of his broad-mindedness and heterodoxy in matters of Dīn. "