Why We Should Not Tithe

Give, but give properly. Give out from our freedom in Christ, not under obligation. Not out from grief or need. Give because we are loving those who support us in our Christian life, not to gain something from God. We have all things in Christ. The ministry needs our support, but it is not about the money, it is about our involvement with those who teach the word of God and train us to use what God has given to us in Christ so that we are living a life that is pleasing to God. For in so doing our sacrifice is well pleasing to God.
Indeed I have received all and I abound, I am filled up where I lacked having received from Epaphroditus the things from you, a fragrant smell of an acceptable sacrifice, well pleasing to God. – Philippians 4:18