well below pretty much any country in the southern hemisphere other than australia and nz. but the average was something like 82% of people saying that religion was an important part of their lives, while in the u.s. only 2/3 of people said it was an important part of their lives. india was about average in its response (a few pts below the mean response). it was really african countries that dominated the list. then you can talk about the arabian peninsula and south east asia (which helped round out the top 20%). saudi is in that top 20%, but is not among the highest.
I would guess that nations in the southern hemisphere are predominately Muslim, and Islamic nations were its the majority religion, are intolerant of non-Muslim religions.
as to your second point…it was interesting that even among americans who identified themselves as religious, about 70% of them said that everyone could find salvation through their own religion (the question was a fairly blunt tool…it was an either or: salvation can be found only through my religion vs. many religions lead to eternal life). catholic response was closer to 80%. the only groups that REALLY rejected the idea of other religions as paths to salvation were the JWs and the Mormons.
Whether one believes salvation can be obtained through other religions is irrelevant to my statement about nations being intolerant other faiths.
I as a Christian believe that salvation can be achieved through the Catholic Faith, but here in the USA, we do tolerate the beliefs of others.