Many people claim to know Jesus but on the day of judgement (when it's too late) they're going to realize not only did they not know Jesus but Jesus will profess He never knew them Matthew 7:21-23.
If someone where to ask me what they had to do to go to heaven my response would have to be the same as Peter's when he was asked "what shall we do" the day the New Testament church was birthed. and Peter's response was "Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins and you shall receive the gift of the Holy Ghost. (I use the King James version) Acts 2:37-38
That is how you are born again of water and of the Spirit John 3:3-5
The Gospel is the death, burial, & ressrrection of Jesus Christ(1 Corinthians 15:1-5), so how do we obey the Gospel (2 Thessalonians 1:8)
Romans 6:1-7 helps give us the understanding: We die (death)to our sinful ways through repentance We are buried (burial) with Him through baptism and we will be resurrected (resurrection) if we have His Spirit dwelling inside of us. Romans 8:9-11
Ephesians 4:4-6 There's only one way!
The church began in Jerusalem in the book of Acts not in Rome (Romans 10:9) that was a letter to a church already born again.