Malachi 3:10 "Bring ye all the tithes into the storehouse..."
No person is a "good Christian" who fails God in giving. Christianity is "giving". The Bible tells us "God loveth a cheerful giver." Church members who are sensitive about "giving" are usually out of the will of God. The faithful Christian is one who realizes that giving is a vital part of our Christian life. Jesus made the issue quite clear when He said that those who love Him would obey Him and keep His commandments. It is not so much what we profess...but what we practice...that determines our real devotion to the Lord Jesus Christ.
If you are not a tither...then may God give you the grace to start to do so. The word "tithe" means "tenth". As a principle of ownership, we learn from God's Word that the tithe is the Lord's. No Christian has given an offering unto the Lord who has not first given a tenth. Our offerings are those gifts which we bring to the Lord above our tithes. The tithe is God's plan for financing the work of His church and the carrying out of the Great Commission. It is a shame before God that a small minority in every church must bear the financial load. People have money for other areas such as charities and kids' activities and their own recreational activities but no money for the greatest cause on the face of God's earth. It is an insult to Jesus Christ to belong to His church and not be a tither.
If you are not faithful in this area of your Christian life may God give you the faith to begin to be. When you do you will see God bless you in ways you've never seen before.