But my understanding is that 10% is the temple tax, not what Jesus was talking about in the "render unto Caesar" verse. Oh, and as far as religious tax goes, 10% for the temple was not the end of Jewish taxation. I'm not going to go look it up, but I know there was a social-concerns "donation," to provide for the poor. Prophets frequently warned about abandoning "widows and orphans." It's all laid out somewhere in the first 5 books of the Bible, complete with stories of people being severely punished for not paying their fair share.

And if we're going to talk about rendering to Caesar, that is, the established government, the tax collector collected what Caesar wanted and the tax collector's salary (to be determined by himself) on top of that. You'd be blessed beyond words if it were only 10%.

I do not see where people promote lower taxes as Biblical.

Income taxes aren't all he pays. He also pays fuel taxes, sales taxes, property taxes, excise taxes, and a thousand little niggling taxes instituted to save the rich from having to part with any of their money.

The rich through their paid hacks keep trying to convince him he's being bled dry through income taxes, when those are the least of his problems. His problems (and ours) are all the regressive taxes enacted through the years that sock us the hardest but represent only a few pennies here and there to billionaires.

You might want to show up with a calculator and show him how low his income tax rate really is. Then commiserate with him about all the regressive taxation that really is bleeding everybody dry and let him know that they were all enacted by corrupt men, mostly Republicans, who were trying to protect rich donors from paying their fair share.

Churches primarily provide for gaps in what government misses on social causes.