"As we have already shown there are two cities and two women presented in the book of Revelation. One of the cities is the holy city, New Jerusalem. The other is called Mystery Babylon. They are symbols and symbols are not what they are called, therefore neither of the two cities is a literal city somewhere on earth. If they are not cities, what are they? They are symbols of something else. If they were real cities, as many commentators suppose, they would not be among all the beautiful symbols of the book of Revelation, which is entirely a book of symbols. Most of the preachers today have the first city confused with other things. The vast majority think that New Jerusalem is a description of heaven; therefore they talk about the city as heaven, having golden streets and mansions over the hill-top. But New Jerusalem cannot be heaven because John sees it coming down from God out of heaven! Church theology today has the Holy City, Heaven, and the Kingdom of God all mixed up and confused. Confused -- oh, yes, that is the mark of Babylon! It is obvious they do not know what the New Jerusalem is, nor what Heaven is, nor what the Kingdom of God is!"
Much more in the link:
That first question keeps me awake at night. I wonder how lenient God is and whether He understands, or cares, how difficult it is today to avoid the www mark. If He sees it in strict black and white, we're in trouble.
If you believe that Jesus Christ died on the cross for your sins and rose again on the 3rd day, you have nothing to worry about. This is a great description of what happens and lists the scriptures backing it.
https://www.gotquestions.org/circumcision-of-the-heart.html
Short story, when you believe, you are filled with the Holy Spirit. Before the Spirit can enter you, your heart is cut away from your flesh. The Holy Spirit then "fills" your heart with His Presence (the flesh is sinful and is in everlasting conflict with God.) You have been claimed/adopted as a son of God, in His Son, Jesus Christ. You are eternally secure in salvation.
This is a great place to begin, read one chapter of the Gospel of John a day and reflect on it. The Lord will take it from there.
https://www.kingjamesbibleonline.org/John-Chapter-1/
I do, sir, and I agree with you and do believe I am saved.
satan casts doubt on us every day, we just have to ignore and strengthen our faith.