The ACHA does not have flaws that can be fixed; it's a piece of garbage that must be trashed, and will be. To the extent that the bishops bought into the notion that "pro-life" reduces to anti-abortion, to that extent they share responsibility for the bill they are now criticizing. Trump and the House Republicans are relentless, militantly anti-life and pro-sickness, pro-death.
The ACHA is not a health care bill at all; it's a tax cut bill, part of the larger Trump project, the only one that really matters to him, to cut taxes for the wealthiest Americans and to pay for them (to the extent that he pays for them at all) by taking health care away from millions of Americans.
Donald Trump has demonstrated repeatedly that he doesn't know anything about health care and that he doesn't care about it -- or about the millions of people he will hurt in order to reduce his own taxes.