Well if folks didn't give there would be the issue of paying for the building/utilities/ and other expenses. I don't get caught up on whether a person wants to call it tithing or giving or something else.
You say this to preserve your false doctrine. It absolutely matters how you teach God's children to handle their money. The very first thing to tell is that most people covet their money. Second thing is to tell them to not give anything until they know for certain where and what they are suppose to give.
As far as the tax deduction, it does not really make sense to spend $1 to pay 25 cents less in taxes. Especially since Trumps tax reform. Since the standard deduction was significantly increased it doesn't make sense for many people to itemize any longer.
Yes. It is less likely since Trump. However, it has been the driving force for many for years. I'm glad Trump did what he did. The rich have been taking advantage of charitable giving for their entire lives.
Most people give to get..... and the vast majority do it expecting something from God. Not just Uncle Sam. Problem is, the money is getting spent at the whim of false teachers. God doesn't have anything to do with it.
Certainly you get many pastors who erroneously borrow from the health, wealth, & prosperity gospel and try to connect your financial success with your giving.
Those who preach the tithe are doing just that. They are doing it because they want their money.