The CPCE is the communion of the Protestant churches. 96 Lutheran, Methodist, Reformed and United churches from over thirty countries in Europe and South America belong to it. With that the CPCE represents altogether around 50 million Protestants.
The CPCE exists thanks to the Leuenberg Agreement of 1973. It concluded: churches are allowed to be different because they appeal to the Gospel as their common basis. That sounds simple, but has far-reaching consequences: since then a Lutheran minister can preach from a Reformed pulpit or a French minister lead a congregation in Germany.
