If all churches were to be taxed, the estimated new income would be a paltry $2.4 billion yearly. source
While there is no consensus on the cost to end homelessness, estimates suggest the cost to be more than $300 billion.
So yeah. A bit silly, or at least not an “obvious solution.”
Edit: Meanwhile, taxing the rich and mega corporations is quite effective at retrieving this kind of cash, into the trillions. My personal position, if asked (though I want to be clear taxes were not the original topic at hand), is that taxing owners of multiple residential properties into unafordability is an important step toward ending homelessness.
tldr, The users downvoting this comment are letting their anti-religious sentiment cloud the noxious nature of late stage capitalism. In a world where human lives are less important than profit, for fucks sake the nonprofits are not the primary blame.