Well, mystic, my description to further clarify means converted not from another religion, but from not being a Christian. Many unchurched people come to know the Lord with their hearts. My mother was a Baptist, but she wasn't a Christian, so she became converted from not knowing the Lord to walking with Him. My Dad had a mother who was a Christian, but their family didn't live with each other. The older kids lived on one farm, and the parents and younger kids lived on another farm, and consequently he only got to go to church once or twice while he was growing up. I think when you repent you become converted from serving the Devil to serving the living God, and all things become new, because you are a new creature or creation, or become a new renewed person in Christ Jesus. Old things pass away, and behold all things become new. You are suddenly interested new things, spiritual things, heavenly things. Proselyting is when one church steals members from another church. It is okay to see that another church has what you need and change churches for your own betterment, but it is not good for religious leaders or church workers to try to steal people from other churches so that they can build their church. We call people who are involved in this church hoppers. They go from one church to another church for who knows what reason, and they never get any stability. They may be attracted to another church for many reasons, and some people just have trouble getting along with other people, so when any kind of a problem arises they are off and away to another church. Yes, mystic, enthusiasm in church attenders is great. The natural tendency is for people to really be enthused and ready to go for it in the beginning, and after they have attended church for many years they tend to lose some of the enthusiasm. In Revelations, Jesus calls on the people to return to their first love, when they loved God and served Him enthusiastically!
I guess another way to put it is that new Christians have higher expectations often for themselves and others than people who have been Christians for a long time. Often times they are offended when people fail to meet their expectations, or they become discouraged when they don't live up to the expectations they ahve for themselves. They often are like Peter who was ready to conquor the world for Jesus, but when the test comes they fail, and then they need forgiveness and words of encouragement!