There are basically two reasons giving matters.
First, God commands us in the Bible to give to the cause of the Kingdom.
It is not an optional gesture He leaves to our discretion.
Jesus actually talked about money more than almost any other subject.
He did not do so because He was infatuated with getting rich.
In reality, He died naked and poor by worldly standards.
He addressed the subject of money and wealth because
He knew the way people earn, spend, save, invest and give their money
is the clearest indicator of their true priorities and passions.
It is why He said, “For where your treasure is, there your heart will be also”
(Matthew 6:21, ESV).
Second, the ministry and missions of the church cost money.
The gospel is free, but getting the gospel into people’s lives happens
by using buildings, pastoral staff, curriculum, events, utilities, etc.
Your giving matters greatly to all the ways the gospel is shared.