Do you know the author of 1 Corinthians and the date he wrote it? He persecuted Jewish Christians.
Do you think the adulterers and murderers are in heaven?
Now I'll address this. I was on my way out the door to my son's school Christmas play when I read it. Yes, Paul (who was formerly Saul) was the author of it. He most likely wrote it between 50 and 60 A.D. As I said, he was formerly called "Saul" and was most definitely a persecutor of Christians. He arrested them and took them to Jerusalem under the authority of the Sanhedrin. On the road to Damascus he had an encounter with Christ, went to the city of Damascus and was told what to do to become a Christian by a disciple named Ananias, after which he obeyed and became a Christian himself. He was a "chosen vessel" to take the gospel message to the Gentiles. When talking about his life years later he described himself as one who was a blasphemer, a persecutor and an insolent man, but he said he did it ignorantly and in unbelief. He was converted to Christianity and changed his life, not unlike Phil Robertson.
He then went on to write at least 13 of the books that make up the New Testament. Here is where you and I will no doubt disagree but I believe Paul, and in fact all the writers of the Bible were divinely inspired and what they wrote was literally from the mind of God. This is a belief held by all of the fundamentalists that I know.
So to your last question, are there adulterers and murderers in heaven? I believe that when those who get to go to heaven go there, that there will be those who have committed adultery and murder and even some who have participated in homosexuality there. But they, like Paul and Phil and any of us, will have repented and been converted. It is the law of God. Let me quote a little further from the same place Phil started from:
1 Corinthians 6:9-11 (NKJV)
Do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived. Neither fornicators, nor idolaters, nor adulterers, nor homosexuals, nor sodomites, nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners will 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 and by the Spirit of our God.
These were Christians Paul was writing to. Notice the past tense...they were unrighteousness, fornicators, etc. But they changed.
So yes I know very well who Paul was.