Salvation demands the proclaimed gospel and proclaimed belief.

If you confess with your mouth, “Jesus is Lord,” and believe in your heart that God raised him from the dead, you will be saved. One believes with the heart, resulting in righteousness, and one confesses with the mouth, resulting in salvation. For the Scripture says, Everyone who believes on him will not be put to shame, since there is no distinction between Jew and Greek, because the same Lord of all richly blesses all who call on him. For everyone who calls on the name of the Lord will be saved.
How, then, can they call on him they have not believed in? And how can they believe without hearing about him? And how can they hear without a preacher? And how can they preach unless they are sent? As it is written: How beautiful are the feet of those who bring good news.
Romans 10:9-15 (CSB)