When a person repents, is baptized in Jesus name, and is filled with the Holy Ghost, God forgives all this: 

"Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind, nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners, shall inherit the kingdom of God.  

“And such were some of you: but ye are washed, but ye are sanctified, but ye are justified in the name of the Lord Jesus, and by the Spirit of our God." - 1 Corinthians 6:9-11 KJV 

God forgives - we should too. If we truly have the love of God in us, we will forgive. 

"But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us." - Romans 5:8 KJV  

When we have “enemies”, we will not look forward to God's justice and judgment upon them. Instead, we will pray for God's mercy and that He forgives them, just as He forgave us. 

"And such were some of you..." - 1 Corinthians 6:11 KJV 

How did we escape God’s judgment for the sins we committed? We turned from our sin and applied the blood He shed for us by baptism in His name. 

"Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost. For the promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call." - Acts 2:38-39 KJV 

"And be kind to one another, tenderhearted, forgiving one another, even as God in Christ forgave you." - Ephesians 4:32 NKJV 

"And they stoned Stephen, calling upon God, and saying, Lord Jesus, receive my spirit. And he kneeled down, and cried with a loud voice, Lord, lay not this sin to their charge. And when he had said this, he fell asleep [died]." - Acts 7:59-60 KJV  

"For if ye forgive men their trespasses, your heavenly Father will also forgive you: but if ye forgive not men their trespasses, neither will your Father forgive your trespasses." - Matthew 6:14-15 KJV 

"Be ye therefore merciful, as your Father also is merciful.  Judge not, and ye shall not be judged: condemn not, and ye shall not be condemned: forgive, and ye shall be forgiven:" - Luke 6:36-37 KJV