Catholic teachings along with Scripture clarify our duties as Christians to support the Church and her works through charitable giving.
Charity is one of the three theological virtues.
Charity is the theological virtue by which we love God above all things for his own sake, and our neighbor as ourselves for the love of God. Catechism of the Catholic Church (CCC), Sec. 1822
" If I . . . have not charity," says the Apostle, "I am nothing." Whatever my privilege, service, or even virtue, "if I . . . have not charity, I gain nothing." Charity is superior to all the virtues. It is the first of the theological virtues: "So faith, hope, charity abide, these three. But the greatest of these is charity . CCC, Sec. 1826.
Our giving to the Church is a way to honor God.
Honor the Lord with your wealth, with the first fruits of all your produce . (Proverbs 3: 9 - 11)
We give because all we have, including our materials possessions, is entrusted to us by God.
For all in heaven and on earth is yours; yours, LORD, is kingship; (1 Chronicles 29:11)
You can't take it with you and you should instead store up treasure in heaven.
Do not store up for yourselves treasures on earth, where moth and decay destroy, and thieves break in and steal. (Matthew 6:19)
Our giving is pleasing to God.
Do not neglect to do good and to share what you have; God is pleased by sacrifices of that kind. (Hebrews 13:16)
We are called to be intentional and effective in our giving.
Now as you excel in every respect, in faith, discourse, knowledge, all earnestness, and in the love we have for you, may you excel in this gracious act (of giving) also. (2 Corinthians 8:7)
Giving is actually beneficial to us as Christians.
Keep in mind the words of the Lord Jesus who himself said, It is more blessed to give than to receive. (Acts 20:35)
When we give to others, it's as if we're giving to Jesus himself.
Amen, I say to you, whatever you did for one of these least brothers of mine, you did for me. (Matthew 25:40)
We should take care of our fellow brothers and sisters in God's family.
Contribute to the needs of the holy ones, exercise hospitality. (Romans 12:13)