Partially yes, because it is due to the merits of the Sutras
itself. Of course, does not mean one can commit all sorts of things
and then chant the Name (Namo Amituofo/Namo Amida Butsu) or the
Sutras thinking one can "cleanse" oneself.
I am a non buddhist can I help to chant to help my mum go
rebirth at pureland?
I actually not sure where she is now. I saw flash of
white light and once or twice flash of blue light in my house at
night. I believe she comes back.