When people ask about "the main church," it's usually helpful to understand what they're looking for a church that:
* Has the most followers: Christianity has the largest following worldwide.
* Has the richest history: Christianity is historically one of the oldest religions.
* Is most influential: Christianity is one of the most influential religions.
Within Christianity, there are 3 major groups:
* Catholic Church: The Catholic Church is the largest single Christian denomination.
* Eastern Orthodox Church: A body of Churches that follow similar traditions.
* Protestant Churches: This is a very broad category that includes many different denominations (e.g., Baptist, Methodist, Lutheran, Presbyterian, etc.).
Is there a particular country or city where you're trying to find the most prominent church? If you have something more specific in mind I can give you a more relevant answer.