This is the same story that we can find in Nietzsche, though his response was to leave Christianity entirely. This person was raised in a Protestant tradition. From a Catholic perspective, there are truths in the Protestant traditions, but they are imperfect and flawed. So the members of these congregations sometimes turn away from them and criticise their flaws. And it comes across as a criticism of Christianity - but it's a criticism of the Protestant tradition, which had flaws, which they were raised in. It's OK to criticize the denomination, but realize that the criticism doesn't hold for Catholicism.
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