If the new covenant under Jesus Christ called for a tithe of ten percent, the writers of the New Testament had plenty of time and space to communicate such. However, not once in the New Testament is a percentage of giving mentioned. Not once.
There are many references in the Old Testament requiring a specific amount and a specific quality of giving. When an amount was stated it was ten percent. Quality had more to do with the best and the first.
Under the new covenant, God made it clear that our love for Christ and one another should rule our response to giving. Before Christ, God’s chosen people had rules and regulations to follow and they were often precise and rigid. After the death and resurrection of Christ, all of those living under rules and regulations were set free.
True love and freedom never mandates a response from others, but rather allows others to react according to their heartfelt response to what has been freely given. If one does not recognize the love of another, they either give nothing in return, or simply act under some predetermined obligation.
Christ knew what He gave and He knew how His people would choose to respond. That’s not to say He is always happy with the response. When we don’t freely give back, it seems to me, that God recognizes that we don’t understand or feel the full grasp of His love for us.
Giving under the New Testament requires much soul searching and thought. We were not mandated an exact amount to give, but rather offered an opportunity to respond to the most loving act to have ever happened to humanity. A perfect Creator God gave everything to those He loved. He has given us complete freedom to respond to that love in any way we see fit.
The irony in all this is that God continues to give to us through our own giving to Him. When we help feed the poor, give money to clergy, help build churches, and continue to support the Good News, we only give back to humanity—to ourselves. Do you really think God needs our money? So when an unbeliever complains about all the money given by Christians, they are simply failing to understand love, and the freedom that comes through Christ.