When you go before the White Throne of Judgement the Lord will ask you what you did with your time, treasure and talents. I don’t think saying “I didn’t think I had to tithe” will go over so well.
There is absolutely no Judgment for those that believe in Jesus as the Son of God. Only those not saved face judgment and you cannot prove me wrong and I can prove you wrong with one absolute truth. ‘ Jesus Died for your sins.
You are a misguided “legalist”