Okay, what about just advising him to seek out a councelor within his own church?

he SHOULD NOT seek out "help" from within the church. the last thing this guy needs is the harsh and abusive rhetoric drilled into him, causing more damage.

the church is a construct of man designed to empower the clergy and the church itself. it cares not for its followers.

jesus loves him regardless of who or what he is. A compassionate God could not possibly endorse the sort of harm the church would inflict on him.

we are all gods children and there is nothing wrong with his feelings. he needs to accept himself before he can realistically expect others to accept him.

(This is without reading the OP, don't kill me!!)
First off, is this actually you writing this Ryan?
Second, He must tell them. He can't lock it away forever, it'll make him feel worse than he already is. (?) Keeping something away from friends/family hurts you, he needs to tell them. If they don't accept him for who he is, guess what? They are being horrible Christians/Catholics, even if someone is gay/bi they should be accepted. That's what has been told; treat others the way you expect to be treated. I hope I didn't come off as too pushy...

Tell him that despite what others may feel about him, the one that matters most in all of this - specially for him, from you wrote - is God. God loves him no matter how he was born and He is close to him in a very special way.
He shouldn`t feel bad about it.

If he feels that following a homosexual lifestyle is wrong for him and God is more important, tell him that are people in this world that forsake something that they really want for that purpose alone and for others and that he isn`t alone in that.
If he accepts his suffering like Christ did, Christ will be with him and help him.
Not having a sex life isn`t the end of the world nor is not having someone you like by yourside.

He can and will overcome this.

My advice:

There's no one of us who is without 'sin' in our lives (and if you think you are, then dig deeper you're in denial). Yet Jesus loves us all. So he needs to work on his personal relationship with Jesus/God and less on his relationship with church ATM. Until he's really come to grips with himself/his sexual identity and his relationship with God while 'living in sin' (like we all do to some extent) I'd suggest he not confront his parents with it.

If he's decent looking, he doesn't need confidence. Just go to any gay club and someone will be hitting on him in moments. If he's fugly or it's a small town with no gay area, then online gay communities, he'll find a ton of support.

Chuck the bible at his face.

Joking of course! Just thought of what Daniel Tosh would say.

Truly he needs help because he stopped the drugs so I'm sure he must be going through some sort of withdrawal phase. Just be his friend and just go through every step by his side I guess.

Are you writing this through the eyes of your friend?

Oh! So this is your relatives words? Your relative is talking about another of your relatives and you wanted to help so you asked this? It's all clear now, thank you! I was just confused. XD

I did... isn't this your relative talking about your other relative? 

It's not clear anymore...

If this person has decided for himself that it would be immoral to pursue a homosexual relationship, then regardless of your opinion on that matter you should accept that stance he has chosen to take. However, making him aware that you accept him for who he is regardless of his sexual orientation would be a big step in helping him accept it himself and there is nothing wrong with that.