Salvation is by faith in Jesus Christ. Prophecy and miracles can help strengthen faith, but they are not necessary for salvation, otherwise it's not faith alone
In Revelation 12:17, the woman is described as the one who gave birth to the male child who is to rule all the nations. This imagery symbolizes the Church as the mother of all believers, giving birth to Christ who rules over all, the Church, and the People of God, who brings forth Christ and is persecuted by the forces of evil but ultimately protected by God.
Going a bit further The Church Fathers interpret the woman in Revelation 12 as symbolizing both the Church and the Blessed Virgin Mary. As the Church is the body of Christ, and she's the mother of Christ, they saw her as the new Eve, cooperating with Christ in the work of redemption whereas the First Eve didn't cooperate with God and being the mother of the fall of humanity
Revelation 19.10"And I fell at his feet to worship him. But he said to me, 'You must not do that! I am a fellow servant with you and your brothers who hold to the testimony of Jesus. Worship God. For the testimony of Jesus is the spirit of prophecy.'"
This verse serves as a reminder of the proper object of worship in Christianity and underscores the importance of the message and work of Jesus Christ.