I don't see why someone can say that belief X is more valid than belief Y, and that therefore it's OK to mock belief Y.
There is a difference between belief, ie the acceptance of something unprovable, such as the existence or non-existence of deity, and the acceptance of empirically proveable fact.
TBH I feel uncomfortable with mockery in general. Though I find it perhaps more acceptable when it's over an issue where blind faith ignores proveable fact.
As for the names, what I'm trying to say is that it is in human nature to give names to things we try to understand. The giving of a name eventually gives the thing substance. But the name is not the thing itself.
I read a book by a respected, mainstream scientist in which he tried to explain what came before the big bang. He called it the Singularity. Now, I'm not denying the big bang (I'm no Creationist), but how is his inexplicable "Singularity" any different to my "Deity"? Neither has proven existence, neither has proven involvement, both are a way of trying to explain the inexplicable.