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In the list of 100 Scientists who shaped the world at adherents.com religious beliefs broke down as follows: 

29 Christian 
19 Jewish
 3 Other
11 Atheists
49 Not specified
 
So, scientists of faith outnumber athiests by over 4 to 1.

Certainly some (e.g. Einstein) may have deferred some things to God to avoid criticism from the faith community, and the current 21st century ratio is defiantly lower.
1 Isaac Newton the Newtonian Revolution Anglican (rejected Trinitarianism, i.e., Athanasianism; believed in the Arianism of the Primitive Church)
2 Albert Einstein Twentieth-Century Science Jewish
3 Neils Bohr the Atom Jewish Lutheran
4 Charles Darwin Evolution Anglican (nominal); Unitarian, athiest
5 Louis Pasteur the Germ Theory of Disease Catholic
6 Sigmund Freud Psychology of the Unconscious Jewish; Atheist; Freudian psychoanalysis (Freudianism)
7 Galileo Galilei the New Science Catholic
8 Antoine Laurent Lavoisier the Revolution in Chemistry Catholic
9 Johannes Kepler Motion of the Planets Lutheran
10 Nicolaus Copernicus the Heliocentric Universe Catholic (priest)
11 Michael Faraday the Classical Field Theory Sandemanian
12 James Clerk Maxwell the Electromagnetic Field Presbyterian; Anglican; Baptist
13 Claude Bernard the Founding of Modern Physiology  
14 Franz Boas Modern Anthropology Jewish
15 Werner Heisenberg Quantum Theory Lutheran
16 Linus Pauling Twentieth-Century Chemistry Lutheran
17 Rudolf Virchow the Cell Doctrine  
18 Erwin Schrodinger Wave Mechanics Catholic
19 Ernest Rutherford the Structure of the Atom  
20 Paul Dirac Quantum Electrodynamics  
21 Andreas Vesalius the New Anatomy Catholic
22 Tycho Brahe the New Astronomy Lutheran
23 Comte de Buffon l'Histoire Naturelle  
24 Ludwig Boltzmann Thermodynamics  
25 Max Planck the Quanta Protestant
26 Marie Curie Radioactivity Catholic (lapsed)
27 William Herschel the Discovery of the Heavens Jewish
28 Charles Lyell Modern Geology  
29 Pierre Simon de Laplace Newtonian Mechanics atheist
30 Edwin Hubble the Modern Telescope  
31 Joseph J. Thomson the Discovery of the Electron  
32 Max Born Quantum Mechanics Jewish Lutheran
33 Francis Crick Molecular Biology atheist
34 Enrico Fermi Atomic Physics Catholic
35 Leonard Euler Eighteenth-Century Mathematics Calvinist
36 Justus Liebig Nineteenth-Century Chemistry  
37 Arthur Eddington Modern Astronomy Quaker
38 William Harvey Circulation of the Blood Anglican (nominal)
39 Marcello Malpighi Microscopic Anatomy Catholic
40 Christiaan Huygens the Wave Theory of Light Calvinist
41 Carl Gauss (Karl Friedrich Gauss) Mathematical Genius Lutheran
42 Albrecht von Haller Eighteenth-Century Medicine  
43 August Kekule Chemical Structure  
44 Robert Koch Bacteriology  
45 Murray Gell-Mann the Eightfold Way Jewish
46 Emil Fischer Organic Chemistry  
47 Dmitri Mendeleev the Periodic Table of Elements  
48 Sheldon Glashow the Discovery of Charm Jewish
49 James Watson the Structure of DNA atheist
50 John Bardeen Superconductivity  
51 John von Neumann the Modern Computer Jewish Catholic
52 Richard Feynman Quantum Electrodynamics Jewish
53 Alfred Wegener Continental Drift  
54 Stephen Hawking Quantum Cosmology atheist
55 Anton van Leeuwenhoek the Simple Microscope Dutch Reformed
56 Max von Laue X-ray Crystallography  
57 Gustav Kirchhoff Spectroscopy  
58 Hans Bethe the Energy of the Sun Jewish
59 Euclid the Foundations of Mathematics Platonism / Greek philosophy
60 Gregor Mendel the Laws of Inheritance Catholic (Augustinian monk)
61 Heike Kamerlingh Onnes Superconductivity  
62 Thomas Hunt Morgan the Chromosomal Theory of Heredity  
63 Hermann von Helmholtz the Rise of German Science  
64 Paul Ehrlich Chemotherapy Jewish
65 Ernst Mayr Evolutionary Theory atheist
66 Charles Sherrington Neurophysiology  
67 Theodosius Dobzhansky the Modern Synthesis Russian Orthodox
68 Max Delbruck the Bacteriophage  
69 Jean Baptiste Lamarck the Foundations of Biology  
70 William Bayliss Modern Physiology  
71 Noam Chomsky Twentieth-Century Linguistics Jewish atheist
72 Frederick Sanger the Genetic Code  
73 Lucretius Scientific Thinking Epicurean; atheist
74 John Dalton the Theory of the Atom Quaker
75 Louis Victor de Broglie Wave/Particle Duality  
76 Carl Linnaeus the Binomial Nomenclature Christianity
77 Jean Piaget Child Development  
78 George Gaylord Simpson the Tempo of Evolution  
79 Claude Levi-Strauss Structural Anthropology Jewish
80 Lynn Margulis Symbiosis Theory Jewish
81 Karl Landsteiner the Blood Groups Jewish
82 Konrad Lorenz Ethology  
83 Edward O. Wilson Sociobiology  
84 Frederick Gowland Hopkins Vitamins  
85 Gertrude Belle Elion Pharmacology  
86 Hans Selye the Stress Concept  
87 J. Robert Oppenheimer the Atomic Era Jewish
88 Edward Teller the Bomb Jewish
89 Willard Libby Radioactive Dating  
90 Ernst Haeckel the Biogenetic Principle  
91 Jonas Salk Vaccination Jewish
92 Emil Kraepelin Twentieth-Century Psychiatry  
93 Trofim Lysenko Soviet Genetics Russian Orthodox; Communist
94 Francis Galton Eugenics  
95 Alfred Binet the I.Q. Test  
96 Alfred Kinsey Human Sexuality atheist
97 Alexander Fleming Penicillin Catholic
98 B. F. Skinner Behaviorism atheist
99 Wilhelm Wundt the Founding of Psychology atheist
100 Archimedes the Beginning of Science Greek philosophy
Source: 100 Scientists who shaped the world at adherents.com

In "Leading scientists still reject God" Nature, July 23, 1998
A 1914 STUDY found that 58% of 1,000 randomly selected US scientists expressed disbelief or doubt in the existence of God, and that this figure rose to near 70% among the 400 "greater" scientists within his sample.

Francis S. Collins, M.D., Ph.D., director of the director of the National Human Genome Research Institute (NHGRI) from 1993-2008 and director of the NIH starting in 2009, is also a evangelical Christian. And makes strong arguments for reconciling science and religion.

Greater Scientists
Belief in personal God 1914 1933 1998
Personal belief 27.7 15 7.0
Personal disbelief 52.7 68 72.2
Doubt or agnosticism 20.9 17 20.8
Links:
A Climate for Change: Global Warming Facts for Faith-Based Decisions
Was Darwin a Christian? Did he believe in God?
Nature, "Leading scientists still reject God" July 23, 1998

Last updated 6 Dec 2007