A true born-again Christian cannot go to hell because of a sin they do! Whether that sin is of commission (intentional) or omission (omitting to do something). Tithing is a ritual act that is mentioned both in the Old and New testament. Malachi 3 talks about God's judgement against His people (Israel), because they rob Him in tithings and offerings. Tithe means 10th (in the Hebrew).
Now, we must remember, a Christian who sins (which is every Christian), cannot go to hell for sinning, because then it makes Jesus' death on the cross null and void. Which sins did Jesus die for on the cross? Did He die for some sins are all sins. Legalism is someone telling you that you must do something or else...
Tithing is good and it is in the only thing in all of Scripture that we can put God to the test on, to see that He will make good on your investment. Tithing is the only area God promises a return on an investment...usually more then you given. God is a debtor to no one! By the way, I tested God on this, when I had given in January and went a whole year without seeing any financial increase. By December 8, I asked God about it and then two days later, I landed a large client...the biggest I had ever come across. God is good! I never tested Him after that about making good on His promise, as mentioned in Malachi 3
By the way, some people will say that the New Testament or Jesus never said to tithe. Listen to Jesus words in Matthew 23:23, "Woe to you, scribes and Pharisees, hypocrites! For you pay tithe of mint and anise and cummin, and have neglected the weightier matters of the law: justice and mercy and faith. These you ought to have done, without leaving the others undone." Notice the words, "without leaving the others undone." Jesus is referring to tithing!
Remember, if you give cheaply, then you will be rewarded cheaply. In the measure in which you give, is how it will come back to you. God loves a cheerful giver. And if you give to be seen by men, then no reward for you...just the praise of man!