There are some people who say they are Christians who are not welcome for fellowship:
1 Corinthians 5:9-13
I have written you in my letter not to associate with sexually immoral people— 10 not at all meaning the people of this world who are immoral, or the greedy and swindlers, or idolaters. In that case you would have to leave this world. 11 But now I am writing you that you must not associate with anyone who calls himself a brother but is sexually immoral or greedy, an idolater or a slanderer, a drunkard or a swindler. With such a man do not even eat. 12 What business is it of mine to judge those outside the church? Are you not to judge those inside? 13 God will judge those outside. "Expel the wicked man from among you."
"sexually immoral" (anyone involved in a unlawful sexual relationship) includes:
- adulterers (sex with another while first spouse lives = marriage to another following divorce)
fornicators (sex without marriage)
- incestuous (sex with family)
- homosexual (sex with same gender)
- bestiality (sex with animal)
"greedy" is anyone whose desire for material things motivates them to disobey the New Testament.
"idolater" is anyone who follows a god, philosophy, teaching, or system of thinking other than that of the New Testament.
"slanderer" is anyone who expresses lies about people or God.
"drunkard" is anyone who gets drunk on alcohol, or any other form of substance abuse.
"swindler" is anyone who makes agreements that he does not keep, does not pay what he owes, tells lies to pay less, take advantage, defraud, or manipulate others.