In a Christian church, you can hang a cross at most, or nothing at all. In the Catholic church, besides the cross, there are many portraits, such as Jesus, the Virgin, saints and so on.
2. Historical differences
At first, there was only one church in Christianity. 1054, the eastern and western churches split. Western churches centered on Rome call themselves "Catholicism", while Eastern churches centered on Constantinople call themselves "Orthodox Church" or Orthodox Church. /kloc-In the 6th century, the Reformation took place in Western Europe and Northern Europe, and the Reformed Church was separated from Catholicism and collectively called Protestantism.
3. Differences in titles and ranks of clergy.
In Christian churches, priests and patriarchs are mainly responsible for church affairs, and occasionally some Christian factions have the title of bishop. The Catholic Church is mainly managed by bishops and priests. The highest rank is the Pope of the Vatican, usually called the Pope.
4. Differences in church forms
Catholicism still retains a unified church, calling itself "the most sacred, open and handed down by the first apostle", and the Vatican is the center of Catholicism in the world. The Orthodox Church originally had a unified church centered on Constantine. With the demise of the Eastern Roman Empire, churches in various countries were not unified, but Constantine, the patriarch of Istanbul, retained the title of "ecumenical patriarch" today. Protestantism has not had a unified church since its birth. The main Protestant sects are Calvinism, Lutheranism, Anglican Church (Anglican Church) and so on.