No, but he who thinks he is without sin is deceiving himself.
Furthermore, I'd guess that the most serious sins are the ones that a person doesn't recognize, and thus doesn't repent or try to change. Again, if you stop focusing just on sexual sin, but look at Jesus' teachings as a whole or even the entirety of Paul's lists, I'd bet just about all Christians not only commit sin, but repeatedly commit sins that they don't admit.
That's not to say that we should accept that, but I think it's something that God is going to forgive. I hope and believe that even people who try to exclude gays from the church can be saved.
That's not the point. The religious point of this discussion IS on homosexuality and particularly in the church.
And as ANY sin that takes place in a believers life it can lead them away from God.
Jesus teachings on the whole certainly indicate this.
God will not and does not automatically forgive unrepentant ongoing sin. And I quoted the scripture to show that. There is also this.
Whoever makes a practice of sinning is of the devil, for the devil has been sinning from the beginning. The reason the Son of God appeared was to destroy the works of the devil. No one born of God makes a practice of sinning, for God's seed abides in him, and he cannot keep on sinning because he has been born of God. By this it is evident who are the children of God, and who are the children of the devil: whoever does not practice righteousness is not of God, nor is the one who does not love his brother. I John
Put to death therefore what is earthly in you: sexual immorality, impurity, passion, evil desire, and covetousness, which is idolatry. On account of these the wrath of God is coming. Colossians
Now the works of the flesh are evident: sexual immorality, impurity, sensuality, idolatry, sorcery, enmity, strife, jealousy, fits of anger, rivalries, dissensions, divisions, envy, drunkenness, orgies, and things like these. I warn you, as I warned you before, that those who do such things will not inherit the kingdom of God. Galatians
So we see that unrepentant continual sin will separate us from God. Remember this is a matter of WILL. The bible also tells us that we as believers do commit sin. But we also ask for forgiveness. In the context of THIS conversation, a Christian cannot be a practicing homosexual and remain forgiven. For they are making a practice of sinning.
Just like any believer who makes a practice of continual sin of any kind. They are in grave danger. I'm not the judge of when that occurs. I don't judge in the sense of determining when God let's them go. I am a judge when recognizing sin in a person's life. Just like you and other believers may be the judge to recognize sin in mine. I do not get to decide when a person has crossed the line of receiving the wrath of God and no longer part of his kingdom. I don't have that right. But God does.