Oh, go for Shamanism because it looks like there are some ways to use vipers in there (assuming the snake pit is one of them) and having a religion could be useful.
We can do that, sure. Mind you, we need to capture a viper first. And we can't use it to found a religion because somebody else has already researched it and founded Sikhism. Come to think of it, I ought to do a quick writeup of the techs:
Canine Domestication: Lets us train wardogs and start herding animals.
Games: Prerequisite tech that does nothing.
Petroglyphs: Cave paintings.
Counting: Learn basic counting, improves research.
Microlith: Provides a national wonder that boosts military unit production.
Flint Knapping: Revelas several types of stone, building improves military unit production.
Heat Treatment: Prerequisite tech, with one unique unit we can't build.
Tattoos: If we had dye, tattoos would slightly improve our units' strength.
Stone Building: Basic stone huts.
Spear Making: Take a guess.
Sewing: We don't have any kind of cloth though.
Bead Making: Pretty baubles.
Portable Shelters: Benefits from horses or bison.
Spearfishing: Slightly more food.
Warfare: Learn to fight before you can read.
Tanning: We don't have leather, but we do have bamboo! Bamboo armorers require a city population of 6 but give a promotion that gives a +20% bonus against archery units.
Barter: Reveals resources like amber, silver and gold. Improves economy and
enables barter economic civic.
Atlatl Making: Enables best prehistoric ranged unit.
Fire making: Increases health and lets us build fire pits. Also obsoletes the stick gatherer.
Hunting Tactics: Lets us build the hunter, an upgrade of the tracker. We can build neither though, because we haven't captured enough animals.
Slavery:
Enables the slavery civic, plus fighting pits and crucifixion crosses.
Obsidian Weapons: Enables several unique units.
Arithmetic: Enables two crime-reduction buildings:
Shamanism: First to discover founds a religion. Somebody else has gotten to it first.
Earth Oven: Boosts food.
Tribalism:
Lets us settle new cities. Also enables the tribal society civic.
Pictographs: Prerequisite tech.
Ceremonial Burial: Doesn't actually enable that much, you need other techs like masonry to build most of those buildings.
Boat Building: Lets us build canoes.
Chiefdom:
A better government civic, a building that increases unit experience, and more uses for captured animals.
Animal Husbandry: Various buildings that require animals.
Mysticism: A couple of myths and reveals incense.
Enables divine cult.Mind you, this is all by memory, since I don't have the game open right now.