In this clip, John MacArthur explicitly rejects the claim made by Leighton Flowers that John MacArthur teaches inclusivism (that people can be saved by Jesus, but through some other means that faith in Jesus). Here, from back in 2012, MacArthur challenges the infamous clip of Billy Graham claiming that it’s possible to be saved without hearing of Jesus. He also challenges the Pope on this teaching, who Flowers and Graham claim is a saved believer.
Listen to MacArthur in his own words. He says, speaking of Flowers/Graham/the Pope as “I cannot imagine a belief more disastrous than that.”