Todd,

Eaves, L., Martin, N, & Heath, A. (1990) Religious affiliation in twins and their parents: Testing a model of cultural inheritance. Behavior Genetics, 20, 1-22.

Martin, N. G., Eaves, L. J., Heath, A. C., Jardine, R., Feingold, L.M., & Eysenck, H.J. (1986) Transmission of social attitudes. Proceedings National Academy of Science, 83: 4364-4368.
Lindon Eaves is a key name: former priest and now an integral part of research and interpretation of human behavior genetics research.

always good to hear from you!

Jim