Are we in agreement that prayer doesn't work?

Expanding on a reply I left on Facebook:

Has anyone tried asking God to end the Coronavirus or are we all agreeing that prayer doesn't work?

That's a simplistic approach to prayer. 

i) Whether or not a prayer-answering God exists isn't determined by unanswered prayer but by answered prayer. To seize on a particular example of unanswered prayer is arbitrarily restrictive, as if God granting that petition is the only salient evidence for a prayer-answering God. 

ii) A pandemic is, by definition, a complex event, in this case becoming fairly global in scale. So it's not as if there's only one kind of prayer for God to answer in that situation. The fact that God doesn't prevent or halt the pandemic in toto doesn't mean God hasn't answered many prayers involving particular instances of the pandemic.

The pandemic impacts many people in many different ways, so I don't expect an undifferentiated response from God. Rather, I expect God's response to prayer about the pandemic to be varied and individualized. 

iii) In a cause/effect world, just about every event has a domino effect, the more so with large-scale events like the pandemic. Evils like the pandemic can also be a source of good. Some goods things will happen as a result of the pandemic that wouldn't happen if God prevented it. So it's a question of balancing the tradeoffs. Mitigating the pandemic in some respects without eliminating the beneficial side-effects.