According to the search results, the country with the most churches in the world is the United States, with an estimated 384,000 churches across the country. The United States has a diverse religious landscape, and Christianity is the dominant faith in the country. The number of churches has gradually increased over time due to historical and cultural factors. However, it is worth noting that other sources suggest that Malawi has the highest number of churches per capita, with one church for every 132 people, and a total of 10,000 churches dispersed over its area. Additionally, the Vatican has around 1700 churches, making it the country with the most churches per capita. Therefore, while the United States has the highest number of churches overall, other countries have a higher concentration of churches per capita or per square mile.