Yes, they were all private and therefore paid from from post-tax funds. Therefore they were all taxed and they all existed. You’re comparing two different systems. Ours is broken. We need to tax non-profits because the pain must be shared. If churches can sit on the sidelines they’ll benefit from our pain. If urban black pastors had to pay taxes on their church earnings and RE holdings do you think they’d be Democrats?
Where do you live?
The concept of an income tax is fairly recent ~ the ancients didn’t do it that way. After all the guys who got all the income owned everything ~
BTW, the current mainstream Conservative thinking about the use of taxes to inflict pain of any kind is that the purpose of taxes should be to support legitimate government activity, not inflict pain.