Giving is one of the gifts mentioned in Romans 12:6-8. It is part of the ministry and God rewards all who work for His kingdom.
As the scripture shows in 2Cor 9:11 Paul says that they will be made rich so they can be generous all the time.
Although I believe tithing is one of the Old Testament laws that was done away with when the new covenant was made, I do think that we are all to give all we can to not only support our church but also the missions and people who are in need. The only New Testament reference that I can find to tithing is when Jesus is talking to the Pharisees in Mt23:23. I believe that when He told them not to neglect the others He was speaking to them as Jews, who still had that custom. When the big controversy was going on about the Gentiles keeping the Jewish laws it was made quite clear that the Gentile Christians were not meant to take on the Jewish customs. Forgive me Pastor Ralph, but I think that church leaders have decided to keep this law in effect in order to get more revenue for their churches.