"In heaven's name, why on earth are we here?"

It's our call. There it is. If Heaven isn't the answer, we've got to find it on Earth. What have we got?

Three things are clear. The first is that you have a body and are 'here'. 

The second is we don't know how we got 'here'. No one does for sure.

The third is that we make things up. Ideas, theories and prophecies are what we come up with because we don't know something for sure. When we don't know something for sure, we make something up. Like we eat and breathe and walk and talk, we try to understand.

It's one of the things being here means. Trying to understand.

Then there's the deeply puzzling fourth thing: the 'here' outside our body. We'll never understand that. The best guess is that there's always been a 'here' outside our body, simply because no other idea, theory or prophecy is ever for sure. 

Here must have always been there.

It was just us that was missing.