Simplify the following text for a Grade 5 native English-speaking person.
Original: The Nicene Creed ( Latin : ) is the creed or profession of faith ( Greek : ) that is most widely used in Christian liturgy . It is called Nicene because , in its original form , it was adopted in the city of Nicaea by the first ecumenical council , which met there in the year 325 .
Simplified: There were certain problems with the Nicene creed .