No, sure, it's not.
I mean compare the 2:
survival-horror
zombies (or other weird dead 2-legged creatures)
puzzles
keys
control scheme
item menu (examine?)
Resident Evil was practicly the first survival-horror game (Alone in the Dark?), after that, Silent Hill was made.
I'm not saying it's a simple clone (that's why I said 'clone'), but Silent Hill is based on RE. Although it has a totally different story, and a little bit different kind of horror.
(Or am I
totally wrong? DeathsHand???)