I believe some non-Christians believe a Christian leads a perfect live without any problems. That is far from the truth. I found after becoming a Christian that life can seem to get harder. You are fighting with your past, not wanting to do some of the things you did before knowing it is wrong, but yet still wanting to do it.
When your current friends actually see you change as your walk with God progresses, and you start talking more about God especially when he becomes your main focus they start to not want to hang around you any longer. Eventually they drift away, unless they want the change they see in you.
Sometimes it seems trouble finds you easier. You have more problems after you become a real Christian. I mean truly following Christ, getting into the Bible, and not just acting out the part by going to Church on Sunday only thinking everything is fine.
In some ways it can just be easier to slip back into who you use to be, forget about Jesus, or just be a Christian in name only. Non-Christians tend to view Christians in name only as real Christians, and judge the rest of us on them. Christians in name only say they are Christians, but don't act like it or talk like it. In matter of fact nothing in their life has changed. Many times they don't really believe in the Bible or Jesus, buy they have their reasons to want to try to make others think they do.
What is hard to understand for a non-believer is that trials are brought into your life to help you progress in your walk with God. Sometimes attacks are made in your life to make you loose faith, and/or so you don't influence the people around you.
A christian life is really a bed of roses. It looks and smells pretty, but they still have thorns. If you want the roses, you have to be willing to take the thorns also. In handling the roses, you protect yourself and watch out for the thorns, and most of them will not bother you. Every once in awhile one will snag you or even get embedded. Painful, but take care of the wound, and then go back to handling the roses again with better knowledge than you had before.