faith is the root and works are the fruit.
Depends on how one defines "faith". The question I would have to ask is whether a person has a faith
in him and not just
about him? And if one has faith in him, then I would propose that acting on their faith as Jesus taught is of paramount importance. To me, based on what other verses we see, the latter ("about") probably doesn't suffice. So, iyo, do you agree or not?
But how do you take '... the Lord has laid the iniquity of US ALL on HIM...'? The plural on the singular
throw away words or Jesus dying for a group?
That's beyond the scope of our discussion. However, since you asked, "Eloheim" is indeed plural, but probably most scholars of scripture believe that it's probably a reference to God and the "heavenly hosts" that work with Him. Jesus clearly cannot be God as Jesus frequently draws a distinction through referring to God as "the Father", plus adding that it is "the Father" that knows what's going to happen and not necessarily Jesus himself.
Trinitarians love to play fast & loose with such verses, but it's really just a manifestation of their "confirmation bias". Even within the RCC, the concept of the Trinity is typically referred to as "the mystery of the Trinity". IOW, It's beyond our ability to comprehend.