Quote:
Originally Posted by fraleyight
The burden of proof fallacy should only be used when you are actually engaged in discourse for the existence of something. in that situation (such as a forum like this) the burden of proof is indeed on the one who claims the thing in question exists.
In the example in OP, the atheist is the one who bears the burden of demonstrating the reasonableness of his challenge. You will notice in OP that the atheist it the first one to make an affirmative claim ("There is no God!"). That's the claim that requires a form of justification.
Consider the following exchange:
A: X is true!
C: Why should we believe X?
A: Prove to me not-X.
Do you see the similarity? It has less to do with claiming existence as it is the structure of the conversation.
In general, there's no sense in which there is an automatic burden to prove everything immediately upon being questioned at any time. This does not imply that beliefs are automatically justified, nor does it imply that the beliefs aren't justified.
The context of this forum is no different. If an atheist posts a "PROVE YOUR GOD EXISTS" thread, there's no burden for all the theists to have to present their evidence. Simply raising a challenge is not a sufficient cause to require a response. Some may choose to do so in order to engage in the conversation, but there's no blanket burden placed on all the theists to respond.