"Have you been able to turn your back upon this world and its sinful ways?"
'Sin' is a man-made concept. Nothing more.
"Are all of your close friends Christians?"
There are Christians who are commenters here in FSTDT. Just not the fundie sort like you. I respect them. I would consider them friends. My best friend is a Christian; a long-time one.
"If you have been born again"
I was born just fine the first time. Instead of being 'born again', why not try growing up?
"your unsaved friends will drop you like a bad habit!"
When having sex sometimes, my girlfriend likes to raise up halfway, tease me with her inner muscles, then drop down on me. Oh, and her in a nun's outfit? Thanks for the suggestion! X3
"(Just as an illustration, spray a small amount of "WD-40" lubricant on a surface wet with water and watch how fast the water retreats! A genuine dose of salvation is like the WD-40 where reprobate buddies are concerned.)"
FSTDT Top Tip: Before working, in which you know you're going to get your hands caked in dirt, oil, grease et al (a bike or even a car engine etc), spray a little WD-40 on your hands, and rub it in; work it well in, into every nook & corner. After said dirty task, wash your hands as normal. You'll find the dirt, gunk etc just slides off, leaving clean hands. It even works on blood-soiled skin.