Interesting question. To my surprise you’re 10% turns out to appears fairly accurate.
Now of course, we have no clue about how much religiosity it took to qualify for that list?
How many of those scientists were raised in a church going household and held on to that affliction every time they had to fill out that line on the form, for personal and professional self-preservation. I mean write Atheist on that line and you’ve just painted a bullseye on the back of your head.
The more telling question would be how many of those “religious” Nobel Laureates accepted God as some sort of notion out there somewhere, a shadow play of something beyond our understanding, something that can give comfort and support through our trying days.
Compared to how may were really religious - like thinking only their God is the key to some everlasting bliss of some imagined nightmare Heaven or Hell.
That would be the much more interesting number (fraction) to ponder.