Possible Clues:

• Upset old lady penning article is creating disbelief
• Answer is probing those people displaying opposition to religion
• Lack of belief in the existence of God
• State of disbelief
• Belief in science -- i.e. maths -- for rationalisation?
• “____ is, I suppose, the supreme example of a simple faith” (GK Chesterton)
• Belief in nonbelief, so to speak
• Articles by the writer writing to overturn conviction
• Disbelief in the existence of God
• The aim's to be converted, having no church