Cutting government charity on the scale that Republican Congresses propose would be Armageddon," according to local charities and food banks. But I think there's an explanation that runs deeper than indifference. I suspect many religious conservatives are well aware that what they propose would mean throwing millions of people into destitution. In fact, they may be counting on it.
Under the law, churches have wide latitude to discriminate and to put conditions on whom they'll hire and whom they'll serve, far more than any private business. In exchange for ladling out soup, they can make people sit through a sermon; they can impose an ideological loyalty test; they can refuse to serve people they think might be gay; they can discriminate for any reason or for no reason at all. (The one thing that churches can't legally do is tell their members how to vote - at least, they can't do this if they want to retain their tax exemption - but they're fighting hard to repeal even that trivial restriction, with right-wing pastors all around the country repeatedly flouting the law and daring the IRS to punish them.)
While most evangelical churches proclaim that they want people to convert voluntarily, their actions show otherwise. When given the chance to coerce their audience, they'll do so gleefully, as we've seen in prison ministries all over the country where inmates are given special rewards and privileges in exchange for their cooperation with religious indoctrination.
What they want, in short, is a captive audience. If government charity were to be cut off, the churches wouldn't be able to come close to supplying the wants of everyone, and so they'd have strong incentive to impose stringent conditions on the people they did help. Only the most faithful, the most compliant, the most submissive would be able to get through the door.
And that's precisely the state of affairs that the religious right yearns for. What they want is to build a theocracy from the ground up, where the poor and the needy are abjectly dependent on a church that can yank away the necessities of life if it judges them insufficiently compliant, and so the masses will have no choice but to be corralled and steered. Even today, we can see this conservative vision put into practice, and witness the terrible consequences that result when it blocks the government from helping the needy. Consider Mississippi, which is both the most religious and has the most churches per capita of any U.S. state. If rosy visions like Ernst's were true, Mississippi would be the best place in the country to live. But in reality, it's the poorest and (by life expectancy) sickest state.
If you thought right wing Christians were furious with poor people getting tax money and having to jump through hoops to show they're really needy, wait until they have to go through the church to get basic needs met. Millions of ready souls to be cared for, and the church can set whatever rules they want in exchange for help, including listening to whom they should vote for.
Which is exactly what the GOP wants.