The decision follows several controversial changes in the country over the last twelve years.
Maoist guerrillas killed sixteen villagers in Peru.
Over 340 million Christians live in areas where they face persecution for their faith.
The measure was adopted unanimously.
"Now I hope, please understand, that I just want to give my child the chance to live,” he told AM 1020 radio.
On the 22nd of April, arsonists even shot at the volunteer firefighters who came to extinguish the fire.
The international congress will take place on the 1st of May
Nadia de Munari, a 50-year-old Italian lay missionary in Peru, died after being attacked in her residence.
The Constitutional Court of Colombia had previously ruled in a separate case that Nieto's words were "constitutionally protected".