It was accurate to say that the Greek Orthodox Church of St. Porphyrios was untouched at the time that this claim was posted, but that is no longer the case.
The Washington Post reported on October 20th that "The historic Greek Orthodox Church of St. Porphyrius, Gaza’s oldest active church, was struck Thursday by Israel as it sheltered hundreds of Palestinians displaced by the war, according to religious officials."
That same article mentions that the strike hit a two-story building within the church compound.
The AP, which found that the church was intact during an October 12th factcheck, has updated their article, as well, adding "A week later on Thursday, Oct. 19, an airstrike toppled a wall at the Greek Orthodox Church of Saint Porphyrios causing serious damage and death."
The church complex has suffered significant damage, but if "razed" means completely destroyed, then it is not accurate at this moment to say that the Greek Orthodox Church of St. Porphyrios has been razed.