Being a Christian is - or should be - a way of life. Regularly visiting the church is just a small part of it. The most important part is everyday life and the way one treats the others. Evil thoughts and deeds are against the spirit of Christianity.
In a church
church
People disagree on the details of how Christianity is properly practiced.
I tend to think of Catholicism as a branch of Christianity. In that case, Christianity is the most widely practiced religion worldwide. Catholicism is the largest group / church / denomination / division within Christianity, and I believe it is the largest such group worldwide as well, considering divisions of all other religions.
Christianity today is practiced all over the world, though in many countries it is practiced in secret because it is forbidden by the government.
For the most part, the Christian church is underground in China. _________________________________________________ Legally, Christianity has been divided into 2 different religions in China: Catholic & Protestant.
Christianity is practiced most today in the Americas, particularly in the United States and Brazil, as well as in Europe, with countries like Russia, Germany, and Italy having significant Christian populations. Additionally, countries in Africa such as Nigeria and the Philippines in Asia also have large Christian populations.
Rome practiced Christianity in 600 CE
At my church the sermons are all about Christianity the religion.
The Calvary Church is associated with the evangelic association of Christian churches. It is a form of the the Protestant denomination of Christianity and practiced by millions of Americans.
All kinds! Islam, Christianity, Jews, anything!
The specific type of Christianity practiced by the eastern half of the Roman Empire was known as Eastern Orthodox Christianity. It developed its own distinct traditions and teachings separate from Western Christianity, eventually leading to the Great Schism of 1054 that permanently divided the Eastern and Western branches of Christianity. Eastern Orthodox Christianity is still practiced today, primarily in countries such as Russia, Greece, and Eastern European countries.