What are the things that are Ceasar's and the thing that are God's?

Tell us, therefore, what do You think? Is it lawful to pay taxes to Caesar, or not?” But Jesus perceived their wickedness, and said, “Why do you test Me, you hypocrites? Show Me the tax money.” So they brought Him a denarius. And He said to them, “Whose image and inscription is this?” They said to Him, “Caesar’s.” And He said to them, “Render therefore to Caesar the things that are Caesar’s, and to God the things that are God’s.”Matthew 22:17-21 NKJV

Tax: To Ceasar The Mode of Payment for Tax is Money because money as God Identify it is a thing that's are Ceasar. Same in today's time, the mode of payment of Tax is money, it's there anyway so, even if we don't like it we are required to give it back and one way to do that is through tax.

Tithing: Tithing now is for Jesus Christ and He is the rightful recipient ONLY since He replaces the Levitical Priest, see link: Will a man rob God?. Its kinda like tax in essence. If we pay tax to the government in money, we too need to pay and that is giving tithe to our Lord Jesus Christ. But, what will be the mode of payment for tithing? Can we pay in terms of money, if the money was already identified by God Himself to be a thing that are Ceasar's or in today's time, a thing that are governments and not a thing that are God's? 

And, by the way, these verse was spoken by Jesus Christ Himself, He was still on earth at that time. His priesthood was not yet official because the bible say: 

“If he were on earth, he would not be a priest, for there are already priests who offer the gifts prescribed by the law." Hebrews 8:4 NIV

Hence, Offering rituals (burnt offering, etc) and tithings at that time were still the things that are God's. And, these sacred activities were done without money or were paid not with money.