We could argurion about this for hours*, but it's quite an interesting discussion. While both shekels and denarii are mentioned in the New Testament, the denarius was the most common Roman coin during Jesus' lifetime and is mentioned in the NT more than any other. It's also the subject of Jesus' famous snipe
Give to Caesar what is Caesar's, and to God what is God's (as the Roman coin had Caesar's face on it). And it's mentioned in other places, such as
The shekel was a weight, and there's some academic dispute to the exact conversion of a shekel but it seems to be about 10 grams. A shekel of silver was used as a bartering material, not a minted coin, in various Semitic communities during the alleged lifetime of Jesus. When the Bible says things like '
1,000 silvers' it means 1,000 shekels of silver.
When the Jewish War broke out (66 CE), the Tyrian mint had ceased to issue silver shekels, but shekels were needed by every Jewish adult male for the payment of the annual Temple tax of a half-shekel. The Jewish authorities wanted to demonstrate their sovereignty and minted their own silver coins. The currency of Israel is the New Shekel, based on these ancient and
beautiful coins.
But the coins in daily use during Jesus' lifetime were denarii (or zuz) and sela'im from imperial mints, while "small change" copper coinage was minted locally in a number of cities, and were considered to be equal to 1/8 the imperial coins.
This is my reasonably well-researched justification for the minor correction to an off-hand joke. Yes, I have far too much free time.
*an argurion is 30 shekels
Edit: Though one could also argue in favour of Drachmas, as Jesus paid his tax with Drachmas out of fishes mouths.
[quote=Matt 17:24] After Jesus and his disciples arrived in Capernaum, the collectors of the two-drachma tax came to Peter and asked, "Doesn’t your teacher pay the temple tax?" 25 "Yes, he does," he replied. When Peter came into the house, Jesus was the first to speak. "What do you think, Simon?" he asked. "From whom do the kings of the earth collect duty and taxes— from their own sons or from others?" 26 "From others," Peter answered. "Then the sons are exempt," Jesus said to him. 27 "But so that we may not offend them, go to the lake and throw out your line. Take the first fish you catch; open its mouth and you will find a four-drachma coin (Stater). Take it and give it to them for my tax and yours." [/quote]
There's quite a lot of currencies mentioned in the Bible. Maybe those Temple money-changers made a lot of sense.