Miracle of healing

I had always heard of miracles of healing. However, I always have doubt, since I can't determined the truth of the person injury. However over the times, there are a few case of healing I came to have more trust on. For example, the healing of a almost blind girl in my college and the health restore. According to my friends(I was not there when it happened) the girl whose one eye was blind(if I am not mistaken) was healed by the Lord after she was prayed for.

The one whose health was restore was one of my mother's church member. A person whom my mother had been trying to let him know more of Christianity. I know not of that person personally, however my mother said he drinks and smoked heavily to the point that he have only months to lived because of liver failure.  However the Lords show mercy and grace. Though he is said that his liver damage is irreversible and cannot be heal or cure by doctors, his liver according to the last medical test conduct by the doctors was healed after he was pray by pastors and  sisters and brothers of the church. The lord had done the impossible.The good lord show mercy and grace to everyone. He heal even those who had sin by defied their body. Prayers does work. Blind eyes healed and health restore. 

Puzzle

I had been a Christian for a long time. Being a person who had little or no social activities, I have lots of times to ponder and think about things. Things that concerned about religion, philosophy and logic thinking always popped into my mind. However not all question I've taken them seriously, some just comes or ignore, others left their imprints in me.I guess that happened when you have lots of free time and don't know what to do. One of these question are about offering and cross. 

In my christian life, I had attended many services and missed many of it too. But one things I notice it the service during Sabath day run routinely. there is always the prayers, then the worship- singing hymn which followed by offering collecting and finally sermon. After sermon prayer is prayed before everyone leave. When it time for offering, I had always wonder how the money is used. Some church I know, do charity work and community work that require lots of money to do, but how about those churches that has does not involved in such activities. I had heard that some people who opt for full time ministering or missionary are being paid by the church. It is very noble and faithful to do so but should they been paid for it? I mean minister in biblical time never receive salary.They earn the money themselves. I mean Paul is a tent maker, the twelve disciple are fishermen, even Jesus, son of god is a carpenter. So why nowadays some people get paid for ministering? 

Some other thing bother me also. the cross that had been placed in worshiping hall in some churches. I have read the tenth commandment. one of the commandments clearly said no idolatry. Some people said the cross is to remind them about salvation and Jesus died to save our sin. Yes it is not wrong to remembered Jesus death save us. But can't it be done other way, taking the Holy Communion for example? Isn't praying, singing in from of the cross consider idolatry?