"Our ancestors worshiped on this mountain, but you Jews claim that the place where we must worship is in Jerusalem." “Woman,” Jesus replied, “believe me, a time is coming when you will worship the Father neither on this mountain nor in Jerusalem. You Samaritans worship what you do not know; we worship what we do know, for salvation is from the Jews. Yet a time is coming and has now come when the true worshipers will worship the Father in the Spirit and in truth, for they are the kind of worshipers the Father seeks. God is spirit, and his worshipers must worship in the Spirit and in truth.” The woman said, “I know that Messiah” (called Christ) “is coming. When he comes, he will explain everything to us.” Then Jesus declared, “I, the one speaking to you—I am he.”[John 4:20-26]
Apparently the Samaritans were worshipping idols and not the One, True God. Jesus said they did not know what they were worshipping. That goes for all , even them in remote areas where the word of God has not been proclaimed. Then we can read But what does it say? “The word is near you; it is in your mouth and in your heart,” that is, the message concerning faith that we proclaim: If you declare with your mouth, “Jesus is Lord,” and believe in your heart that God raised him from the dead, you will be saved. For it is with your heart that you believe and are justified, and it is with your mouth that you profess your faith and are saved. As Scripture says, “Anyone who believes in him will never be put to shame.” For there is no difference between Jew and Gentile—the same Lord is Lord of all and 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 the one they have not believed in? And how can they believe in the one of whom they have not heard? And how can they hear without someone preaching to them? And how can anyone preach unless they are sent? As it is written: “How beautiful are the feet of those who bring good news!”[Romans 10:8-15] That which I underlined in the bolded portion is the crux of mysticism. How can anyone believe in God's Christ without ever hearing about Him? They can not. This knowledge is given to us by Him via the proclamation of His word.