Matthew 22:21 Jesus said "Render to Caesar the things that are Caesar's; and to God the things that are God's."
Our Lord's response quoted above had nothing to do with tithing.
The question before Jesus was whether or not one should pay TAXES to the government. Jesus said nothing about tithing except to point out generosity of those who gave money they couldn't afford. Those gifts, btw, were above and beyond the requirements of Mosaic Law. Again, the context of NT teaching about gifting is that it should be done from the abundance of the heart. It is not a legalistic practice.
This brings up an important issue - WWJD with regard to allegiance to a government. Jesus' example was to obey the civil laws and to pay taxes. He did nothing else.
HE did not pledge allegiance to the Roman government (or to the Sandedrin or Herod - the Jewish government).
HE did not 'support the troops' (invaders in a country where they weren't welcome, oppressors of the civil population, despots with regard to political liberty).(*)
HE did not acknowledge the presence of icons of worship of the government in the houses of prayer (churches today have a national flag displayed in a position politically superior to the cross).
HE did not justify Roman wars of conquest as a gift from God (they weren't).
HE did not proclaim that Caesar was a man to be admired.
HE did not salute or honor icons of Roman government such as flags, banners, parades, etc.
Jesus acted, as we should, like an ambassador or traveler from another country, which in fact is exactly what He was.
Did I go off topic with this?
Perhaps a little, but as the quoted text at the top had to do with a political subject outside the context of tithing I felt it important to clarify the issue.
Tithing is never required in the New Covenant. It is a matter of
Mosaic Law that is misinterpreted so as to justify the necessity of collecting funds to maintain a venue for religious observance.
Does God bless the giving of gifts?
He most certainly does as is reflected in scripture and the testimony of the saints. Disciples of Christ are admonished to adopt generosity as a positive character trait.
Giving from the heart is better than giving from the Law. There is an important difference, however, that should not be forgotten in the midst of the frenzy to collect donations. The other side of the coin is responsible stewardship of finances made available through gifting. Sadly, most churches in the US have been negligent in this. Most churches in the US are obscenely in debt due to mismanagement of the funds God has provided to them. If someone wants to get into quoting legalistic regulations I submit that those who've been pilfering the purses of our churches are kin to Judas rather than Jesus. They should be summarily dismissed as officers of the church, perhaps even found responsible in a civil court of law. How's that for legalism?
and that's me, hollering from the choir loft...
(*) Soldiers and military officers appear in scripture as persons seeking the Kingdom of Heaven. Within the context of this journey, they are recognized by God and blessed accordingly. They are rewarded with spiritual blessings not military success.