this is a very good thing marcus. dont let go of this questioning/open-mindedness.
also a very good question you ask. i am not going to answer for BG, but instead will give my own answer, also being a Christian whos life was saved and delivered from slavery to drugs and alcohol by God. what i would do is pray for my friend first and foremost, as well as try to bare witness to all the similarities we shared in our lives before God. i would try to show how God used my love for alcohol and drugs by allowing it to eventually consume me thru addiction whereas what once was my love and passion now became my enemy and master.
this is the tuff thing about addiction. the nature of the relationship changes slowly over a long period of time. the change is so subtle u dont really notice it until u have ended up on opposite poles from where u once started. by then its too late. it is a tuff thing to be forced to come to grips with having to choose between what u thought was ur best friend that has now become ur worst enemy. not just the alcohol and drugs but the lifestyle. it has turned on you.
the place i am in now was a very complex process. it would take a very long time and a lot of words to be able to accurately describe it in a way you could understand it like i do. i dont know if it is even possible. a lot of my understanding comes from enlightenment i have received from the Lord. we learn a lot about life and ourselves thru pain. these type of lessons cant really be imparted thru conversation.
each person has their own process they must go thru. it is my prayer each one is led to the same conclusion as me. unfortunately this will not be the case. all i can do is try to share my experience and what God has shown me in hopes some of it will sink in.
ultimately salvation is between each individual and the Lord. it is a spiritual process. only God can open the eyes of a person to see the truth. this wisdom cannot be imparted from one human being to another without direct involvement from God.
ill leave u with one final thought for consideration: consider the fact that God who sent His son down from Heaven to live and die on the cross so that all who believed would be saved holds faith in very high regard:
now keeping in mind God values faith does not logic lead u to be convinced that God who mentions faith all thru the bible would have it be so that man could not prove his existence thru scientific methods? God - the creator of science? certainly the omnipotent, omniscient, omnipresent, immutable, infinite Creator of all things seen and unseen is capable of putting this universe into existence in such a way that mankind would be unable to prove scientifically that it was created by a divine power..
consider the pride of mankind at his work of science. how high of regard man holds his ability to hypothesize, conclude, theorize, and calculate. does it not seem in the least bit possible all these scientists who say the earth is "x" years old, and "this" happened this way, and "that" happened that way could be wrong? think about all this in the terms of this one scripture:
1 Corinthians 1:21 "For since in the wisdom of God the world through its wisdom did not know him, God was pleased through the foolishness of what was preached to save those who believe."