Ann no MagoMago Tosho Land

The story begins when a suspicious cult called the "Confusion Cult" enter the town. The god they worship is in fact a baby. The red-haired protagonist of the manga named Ann attends the school that the cult founded, and even though she is not popular, she is still loved by her friends. As she continues to rebel against the cult, the door to a mysterious world opens.

(Source: Anime News Network)