2 Answers

Formation of rain:
water evaporates from the surface of the earth, and so air becomes humid/saturated with water. When the air's temperature decreases, water molecules in the air aggregate and form clouds. As water aggregation increases droplets are formed, and then become frozen. Once the droplets are big enough, they start falling, and as they get closer to the earth's surface, they melt and rain hits the ground.
Reproductive system conception:
females have organs called ovaries, from which eggs are released. Eggs reach the uterus, and, if sperms are present there too (which happens after sexual intercourse), one of the sperms may penetrate the egg's outer surface, and form a zygote (the first cell of an embryo).

http://www.geography-site.co.uk/pages/physical/climate/why%20does%20it%20rain.html 

http://www.cyh.com/HealthTopics/HealthTopicDetailsKids.aspx?p=335&np=289&id=1613 

nothing to do with any so called "gods" ;-)