As a tangent:
“Giving 10% of your pretax income to charity is specified in the Bible as tithes and is required by God”
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Pretax?
Just a question. In the old days the marginal tax rate on wealthy was about 80% (+ or -). Paying 10% on top of that and your are left with basically nothing on the marginal income. Government takes 80%, you contribute 10% to God. Do you think tithing might be 10% on your increase. If the government doesn’t give me a choice but confiscates it, it really isn’t my income.
There are some who argue the 10% tithe was given to God which was administered by Israel as a nation of God. Accordingly, if the US were upholding its faithfulness to God, 10% would be more than enough for both the government and to serve God.
Our paying any more to a nation independent of God merely manifests the incompetence of any organization functioning independently of faith through Him.