Attn: Christians, We've Heard Them Already

[John V]

No system will force Christians to answer questions they don't want to.

Some systems will be more fruitful than others. Expecting someone to read and then respond to an entire thread will be less fruitful than just engaging in discussion without reference to another thread.

Fail!

1. It's a question.

It's a loaded question, the implication being that the theists were defeated in the linked thread, and so is an argumentum ad ignorantiam.

2. Refusal to answer a question can be legitimately assumed to mean they don't have an answer.

Not necessarily. Anyone can ask a question of such broad scope that they're unlikely to get an answer on an internet forum simply because participants have limited time and interest.