Would that affect...........?

I knew about the part in Heavy Rain where

[spoiler] Ethan cuts a part of his finger to save his son's life [/spoiler]

Would that affect my experience or the overall story of Heavy Rain if I play it?

Thanks.

No, it doesnt ruin the experience because you dont have to cut off your finger. You decide what the characters do in the game, cutting of ethans finger is an option, but you could walk right out of the room if you wish.