Example:

Your deductions total $18,000 and your tithing is $10,000.

Instead of paying $18 and $18 ($36 total for two years where you take the standard $24 and $24, or $48) you double down on tithing and instead it is $28 and $8, but year two you still get the standard $24, so your two year total is $28 plus $24 or $52 - $4 more than the standard $24 X 2 or $48.

With the standard deduction being $12,700 this year, it provides a much greater opportunity to double down but it still exists in the future. People's income will increase as will their itemized deduction amounts. Low hanging fruit to harvest...