Witnessing to Others

Lately, I have had three good friends inform me that they dont believe in God. Two who have recently denounced Christianity and one who wasn't raised believing and never has. I feel as though God is giving me great opportunities to share my faith with others and save their lives. I have been preparing for this moment for years. I learned strategies at church camp, from friends, through scripture, etc. However, when it comes to the actual moment....I go blank. What did Andy Braner teach me at Kanakuk? What has God showing me in His words to us? Much like that moment when (after taking 3 years of spanish in high school) someone speaks to me in espanol and all I can say by to them is que?
I am also wondering where my....standards are? My friend who grew up not knowing Jesus was my friend for a good semester before I ever discovered she wasn't a Christian. We weren't just "friends" either. We hang out practically every day...and it took me several MONTHS to find out she didn't have the light of Jesus Christ inside her. How does that even happen? Where are my priorities?
One of my friends who recently denounced Christ from his life, is an old, old friend. I cried during our conversation because I was legitimately sad for him. I couldn't imagine go through trials, or joys for that matter, without having hope and faith. He said that he doesn't resent his upbringing in a Christian home because those standards have definitely shaped his moral as a person but he can't ask forgiveness from a higher power each day and allow that higher power to wipe his slate clean. He has decided that as long as he can go to bed each night and know that he is a good person, thats good enough for him.
If anyone has any advice to offer for either of these situations, please inform me. Also, pray for me as I struggle with these situations and that God will give me the guidance I need. Please pray for my friends as well, as they need it most!