There are few doctrines in the church preached more universally than tithing. But, according to the Bible, is it even necessary for Christians?
Firstly, I'm wondering if this a big thing in the US? I've almost never heard a sermon on tithing.
Secondly, in the OT the tithe was always food. They took 10% of their crops to the temple, had it dedicated/blessed then they sat down and ate all the good things that God had given - not forgetting the poor, and the priests who didn't have allotments.
The only time money was involved was if God had blessed them so much that they could not carry 10% of their crops to the Temple.
Then, they were to sell it locally, take the money to Jerusalem, buy food and then sit down and eat.
So if any church insists on tithing according to the Bible - OT - all their members should have allotments. They should take 10% of their crops to church every
year, have a meal after the service, inviting the clergy and all the local homeless to take part, and giving thanks to God for his provision.
THAT is tithing according to the Bible.
Not even in the OT did people take money; 10% of their salary every month, to church to put in an offertory plate. And, as you say, it is not taught at all in the NT.
Someone freely choosing to give 10% of their salary specifically to the church is different. But no church should do what a church in our area once did; talk to members about "not giving enough" to the point where they go through their finances with them to see how they could cut back and give more.