Tithing is unscriptural in NT but Giving is ?

I read a few well-written articles about tithing in the internet recently. These hit me like a brick wall. Tithing is not what we all thought it was. Here are some facts i discovered :

1. Tithing is a requirement of the OT law for the Jews but not for the Gentiles.
2. Tithing is of farm produce and food only not silver or gold a.k.a money
3. The reason why tithes are given in OT is to provide food for the Levites , strangers and widows.
4. Tithes can be sold and converted into money if it is impractical to bring them to the Temple, but it has to be reconverted into whatever food or farm produce the tither desires  in his heart at the Temple.
5. Tithing is not 10% but the tenth cattle or farm produce belongs to God.
6. Tithing is on the increase , not on the capital.
7. Tithes are not paid weekly or monthly.
8. Tithing is based on what one receives from God , not on what one yet to get from God.
9. Only the Levites  are permitted to collect tithes.
10. The Levite priests shall get 10% of the what the Levites collected.
11. There are three recipients of tithes - the Levites & Priests , the downtrodden e,g, widows , orphans , strangers, travellers etc. and own household to be eaten with joy in the presence of the Lord
12. The NT churches did not tithe.
13.  Anyone who tries to observe OT laws is under a curse.
14. There is no mention of tithes in NT but there is mention of Giving
15. Christians are asked to set aside a sum of money on the first day of the week for church workers.
16. The amount or percentage of giving is not specified but it is what is purposed in the heart of the giver.
17. The amount given must be in accordance with income.
18. The amount should be given joyfully and not under compulsion.
19. Tithing of money was started in the 8 or 9 century in France, Europe and institutionalized by the Roman Catholic Church.

I will provide scriptural references for these later as this is just the initial draft.