Two international surveys were conducted during 1991 and 1993 by the International Social Survey Program (ISSP). This is currently located at the National Opinion Research Center (NORC) at the University of Chicago.

Seven questions were asked in 1991:
God: I know God exists and I have no doubts about it
Afterlife: I definitely believe in life after death
Bible: The Bible is the actual word of God and it is to be taken literally, word for word. A yes answer implies that the subject believes in the inerrancy of the Bible.
Devil: I definitely believe in the Devil.
Hell: I definitely believe in Hell.
Heaven: I definitely believe in Heaven.
Miracle: I definitely believe in religious miracles.

Results are shown below. Appended to the list are:

the results of a survey showing the percentage of persons who said yes to the following question:

In your opinion, how true is this? ...Human beings developed from earlier species of animals.. The results are a measure of belief in human evolution, and disbelief in creation science.

Country	God	Afterlife	Bible	Devil	Hell	Heaven	Miracles	Evolution
United States	62.8	55.0	33.5	45.4	49.6	63.1	45.6	35.4
N. Ireland	61.4	53.5	32.7	43.1	47.9	63.7	44.2	51.5
Philippines	86.2	35.2	53.7	28.3	29.6	41.9	27.7	60.9
Ireland	58.7	45.9	24.9	24.8	25.9	51.8	36.9	60.1
Poland	66.3	37.8	37.4	15.4	21.4	38.6	22.7	35.4
Italy	51.4	34.8	27.0	20.4	21.7	27.9	32.9	65.2
New Zealand	29.3	35.5	9.4	21.4	18.7	32.2	23.1	66.3
Israel	43.0	21.9	26.7	12.6	22.5	24.0	26.4	56.9
Austria	29.4	24.8	12.7	11.1	10.0	20.1	27.4	N/A
Norway	20.1	31.6	11.2	13.1	11.4	23.0	17.8	65.0
Great Britain	23.8	26.5	7.0	12.7	12.8	24.6	15.3	76.7
Netherlands	24.7	26.7	8.4	13.3	11.1	21.1	10.2	58.6
W. Germany	27.3	24.4	12.5	9.5	9.3	18.2	22.7	72.7
Russia	12.4	16.8	9.9	12.5	13.0	14.7	18.7	41.4
Slovenia	21.9	11.6	22.3	6.9	8.3	9.5	13.4	60.7
Hungary	30.1	10.6	19.2	4.2	5.8	9.4	8.2	62.8
E. Germany	9.2	6.1	7.5	3.6	2.6	10.2	11.8	81.6

Some observations
* All numbers are in percentages.
* since 1944, the Gallup Poll has been asking Americans whether they believe in God or a universal spirit. The answers have always been 94% or more affirmative. These numbers have been so widely reported in academic articles, and the media that they have been almost etched in stone. However, the ISSP results are under 63%. The wide gap is probably due to the different wording of the question asked. The ISSP requires a degree of certainty of belief that is not present in the Gallup Poll. This shows that many Americans who believe in God are not that certain about their conviction.
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