I am not going to judge him BUT if he were found to be a sexually immoral person, that would have a great deal of impact upon how much we can trust what he says.
1 Cor. 5:9-11
I wrote to you in my epistle not to keep company with sexually immoral people. [10] Yet I certainly did not mean with the sexually immoral people of this world, or with the covetous, or extortioners, or idolaters, since then you would need to go out of the world. [11] But now I have written to you not to keep company with anyone named a brother, who is sexually immoral, or covetous, or an idolater, or a reviler, or a drunkard, or an extortioner--not even to eat with such a person.
The point is that light has no fellowship with darkness. People claim not to "believe" in God, but really they just want to life a life of sin and they want to violate the moral laws of God. So to try to justify themselves they will try to claim that there is no God and that they will NOT be held accountable. But they will be held accountable.
Numbers 32:23
But if you do not do so, then take note, you have sinned against the Lord; and be sure your sin will find you out.