Correct.

...and nothing unclean and no one who practices abomination and lying, shall ever come into it, but only those whose names are written in the Lamb's book of life. Revelation 21:27 (NAS)

The King James Version (KJV) of the Bible says in verse 24: 

"And the nations of them which are saved shall walk in the light of it." Revelation 21:24

Do you need to be perfect to be in the church...the bride of Christ?

For those who have sinned...the first step is to be made free from sin through the blood of Christ and obedience to His gospel (see Acts 2:38-39, Mark 16:15-16, Romans 6:1-17).  Afterward, those that have received forgiveness of sins are continually cleansed of their sin if they walk in the light:

If we say that we have fellowship with Him and yet walk in the darkness, we lie and do not practice the truth; ⁷but if we walk in the light as He Himself is in the light, we have fellowship with one another, and the blood of Jesus His Son cleanses us from all sin. ⁸If we say that we have no sin, we are deceiving ourselves, and the truth is not in us. ⁹If we confess our sins, He is faithful and righteous to forgive us our sins and to cleanse us from all unrighteousness. I John 1:6-9 (NAS)

Man cannot be perfect on his own.  But through Jesus Christ, our names can be added to His book of life.  We also cannot continue in sin...hoping that grace may abound (see Romans 6:1-7).

When a person is part of this group of people, or bride of Christ, God promises to he who overcomes:

"And He said to me, "It is done. I am the Alpha and the Omega, the beginning and the end. I will give to the one who thirsts from the spring of the water of life without cost.  He who overcomes shall inherit these things, and I will be his God and he will be My son."  Revelation 21:6-7  (NAS)

However, to those who do not overcome:

"But for the cowardly and unbelieving and abominable and murderers and immoral persons and sorcerers and idolaters and all liars, their part will be in the lake that burns with fire and brimstone, which is the second death."  Revelation 21:8 (NAS)

Jesus explained what each of us must do enter His church...the kingdom of God.  Here are just a few examples:

Matthew 5:20 -- "For I say to you, that unless your righteousness surpasses that of the scribes and Pharisees, you shall not enter the kingdom of heaven." (NAS)

Matthew 7:21 -- "Not everyone who says to Me, 'Lord, Lord,' will enter the kingdom of heaven; but he who does the will of My Father who is in heaven."  (NAS)

Matthew 18:3 -- "...and said, "Truly I say to you, unless you are converted and become like children, you shall not enter the kingdom of heaven."  (NAS)

Mark 10:15 -- "Truly I say to you, whoever does not receive the kingdom of God like a child shall not enter it at all."  (NAS)

John 3:5 -- "Jesus answered, "Truly, truly, I say to you, unless one is born of water and the Spirit, he cannot enter into the kingdom of God."  (NAS)

Acts 14:21-22 -- "And after they had preached the gospel to that city and had made many disciples, they returned to Lystra and to Iconium and to Antioch, strengthening the souls of the disciples, encouraging them to continue in the faith, and saying, "Through many tribulations we must enter the kingdom of God."  (NAS)

Acts 8:12 -- "But when they believed Philip preaching the good news about the kingdom of God and the name of Jesus Christ, they were being baptized, men and women alike."  (NAS)

1 Corinthians 6:9-11 -- "Or do you not know that the unrighteous shall not inherit the kingdom of God?  Do not be deceived; neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor homosexuals, nor thieves, nor the covetous, nor drunkards, nor revilers, nor swindlers, shall inherit the kingdom of God.  And such were some of you; but you were washed, but you were sanctified, but you were justified in the name of the Lord Jesus Christ, and in the Spirit of our God."  (NAS)

Colossians 1:13-14 -- "For He delivered us from the domain of darkness, and transferred us to the kingdom of His beloved Son, in whom we have redemption, the forgiveness of sins."  (NAS)

James 2:5 -- "Listen, my beloved brethren: did not God choose the poor of this world to be rich in faith and heirs of the kingdom which He promised to those who love Him?"  (NAS)

2 Peter 1:10-11 -- "Therefore, brethren, be all the more diligent to make certain about His calling and choosing you; for as long as you practice these things, you will never stumble; for in this way the entrance into the eternal kingdom of our Lord and Savior Jesus Christ will be abundantly supplied to you."  (NAS)

Colossians 1:21-22 -- "And although you were formerly alienated and hostile in mind, engaged in evil deeds, yet He has now reconciled you in His fleshly body through death, in order to present you before Him holy and blameless and beyond reproach.."  (NAS)

Ephesians 5:25-27 -- "Husbands, love your wives, just as Christ also loved the church and gave Himself up for her; that He might sanctify her, having cleansed her by the washing of water with the word, that He might present to Himself the church in all her glory, having no spot or wrinkle or any such thing; but that she should be holy and blameless."  (NAS)

2 Corinthians 11:2 -- "For I am jealous for you with a godly jealousy; for I betrothed you to one husband, that to Christ I might present you as a pure virgin."  (NAS)

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