Maybe for you it is the wrong question, but there are some protestants who insist that at least a knowledge of the gospel is necessary, it is just that I cannot get them to quantify what exactly is necessary.
We definitely know from the biblical tradition that people can lack knowledge of God:
The Bible tells us “what exactly is necessary.” We can find this in Romans 10, where Paul writes about the Jews saying,
Brothers, my heart’s desire and prayer to God for them is that they may be saved. For I bear them witness that they have a zeal for God, but not according to knowledge. For, being ignorant of the righteousness of God, and seeking to establish their own, they did not submit to God’s righteousness. For Christ is the end of the law for righteousness to everyone who believes. (Romans 10:1-4)
He goes on to contrast the “righteousness that is based on the law” with the “righteousness that is based on faith”:
But what does [the righteousness that is based on faith] say? “The word is near you, in your mouth and in your heart” (that is, the word of faith that we proclaim); because, if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved. For with the heart one believes and is justified, and with the mouth one confesses and is saved. For the Scripture says, “Everyone who believes in him will not be put to shame.” For there is no distinction between Jew and Greek; for the same Lord is Lord of all, bestowing his riches on all who call on him. For “everyone who calls on the name of the Lord will be saved.” (Romans 10:8-13)