I totally stink at understanding poetry .. might as well be Greek.
Here's my guess..
First part suggests to me that "we" saw something evil,bad,burdensome and were enticed by it
This could be a drug,drinking, gambling, addiction, some form of abuse
It was a demon .. something that perhaps should NOT be so enticing...
the demon did not call us,
we came.
the demon bid us go,
we stayed.
he promised us death,
we fought for life.
through fire, we stood by him.
into hell, we followed him.
we were his because.
because,
because...
And as a result of our following and embracing of this so called demon we became it ourselves ( or became one with it ) .. and others repeated the cycle .. this time following us.
we were his because,
behind us there were
those who should not be
what we were.
Actually .. I kinda like this one ..