Did Abraham tithe just one time?

ARGUMENT:

People who oppose tithing often make the claim that Abraham only tithed one time, that his tithe to Melchizedek in Genesis 14 was a one time event that never happened again. According to this argument, because the Levitical tithe was repeated and Abraham's tithe only happened once they are of a different type of tithe and therefore Abraham's tithe cannot be legitimately used as an example for Christian tithing. This argument however has several problems.

PROBLEMS WITH ARGUMENT:

According to the Bible (Genesis 25:7-8) Abraham lived for 175 years. How can anyone say with any certainty that this was the only act of tithing in all these years? The overwhelming bulk of Abraham's life is simply not recorded. People who oppose tithing have a big problem because if something only happened once because it was only recorded once then this creates a problem because the Bible only records Abraham calling on the name of the Lord just three times (Genesis 12:8, 13:4, 21:33). If we accept the premise of the argument this would mean Abraham called on the name of the Lord only three times in 175 years. Are we supposed to believe the prophet, friend of God, and father of the faithful called on the Lord just three times in 175 years? That is unreasonable. 

When Abraham paid the merchant of Ephron (Genesis 23:16) this is the only recorded instance of him paying in shekels of silver. Are we supposed to believe that Abraham was a rich man who only paid in shekels of silver just one time in the entire 175 years of his life? 

Furthermore, Melchizedek was the first mention in the Bible of a priest (Genesis 14:18). Does this mean that there were no other priests for the previous several thousand years? Amraphel is the first mention of a king (Genesis 14:1). Abraham the first prophet (Genesis 20:7). Does this mean that there were no priests, no prophets, and no kings for the previous 2000 years? One third of biblical history and no leaders of this sort? Dr. Henry Lansdell remarks "the human race had been on the earth, according to the received chronology, about a thousand years before we read of musical instruments; and it was a thousand years later still when Abraham weighed shekels of silver as payment. But he would be a bold man who would affirm that before these dates, respectively, mankind possessed neither music nor money!" "The mere omission, therefore, of the definite mention of a law concerning tithe-giving, in the less than a dozen chapters given to us in Genesis concerning the early history of the world, is no proof or presumption whatever that such a law did not exist." (The Tithe in Scripture, p. 21)

When people make the claim that Abraham only tithed one time ask them the question "How do you know?" They don't know. They have no evidence. This is pure speculation and this causes further problems because if it's acceptable for anti-tithers to speculate then it's equally acceptable for pro-tithers to speculate. If someone's imagination is a source of truth then so is the opinion of others. 

There is also no record of Abraham singing. To make the claim that Abraham never sang a song or that he only returned tithe once in 175 years is arguing from silence, it's just speculation. 

And then the big problem of Hebrews 7:9. People who oppose tithing try to separate the Levitical tithe from the tithe of Abraham by claiming they are fundamentally different due to frequency: the Levitical tithe was frequent but according to anti-tithers the tithe of Abraham was a solo, unrepeated event. However this presents a big problem because the author of Hebrews makes the claim (Hebrews 7:9) that Levi symbolically paid tithes  through  Abraham to Melchizedek. Now if these tithes are completely different, that one was frequent and the other was not, that one was holy to the Lord and the other was not this would be a serious error because how could the Levites be said to symbolically give frequent tithe through an infrequent tithe. According to anti-tithers these tithes are as different as apples and oranges. Why would the Holy Spirit say that the Levites paid oranges through Abraham's apples? That would make no sense and it would be wrong unless of course they are in fact of the same nature. To my knowledge, nobody in the anti-tithing community has ever been able to overcome this problem. 

It has been my experience repeatedly that when confronted with these problems the opponents of tithing just drop the argument and try to move to something else. They cannot defend their claim so they do the whatabout, "What about this or what about that?"