The leading natural resource in Nigeria is oil
The questions about language and religion depend a lot on where the 100 people are (assuming all of them are in the same place). In terms of money, 25 people would be really rich, 50 people would be middle income, and 25 people would be really poor( I'd probably be a middle income person). The specific amount of money would depend on the time period. Since there are only 100 people, at least 90% of them would have the same religion. Also, the chances of war and conflict are really low, because everyone would know each other.(Sorry my answer is so long)
Trinidad is the Caribbean island that is rich in natural gas, which has impacted the economy by, due to new factories, turning Trinidad into a major exporter of methanol and ammonia and also attracting developers to the island.