Thousands probably. Noone keeps count.
3
you
It is not in itself a religion, but a practice used in many religions, such as voodoo.
People practice many different religions all across the world.
You mean polygamy? Many religions practice polygamy, including Islam, some Christian groups, and many regional or tribal religions in Africa and Asia.
Islam
they are cathlic
The majority of Germans will practice Christianity as their choice religion. Some Germans will however practice agnostic or Buddhist religions.
The religion that people practice or don't practice in a particular state or place is not important. All religions are in Pennsylvania.
The religions that Chile practice are catholic and Protestant.
Many religions practice or practiced polytheism, including the ancient Greek religion (which is still practiced today), the ancient Roman religion (mostly based on the Greek religion), and many indigenous religions.
It's hard for a US citizen to see how the question makes sense. There are many religions practiced in the US (along with many people who practice no religion at all) because those religions exist. Anyone is free to practice religion in the US as he/she sees fit, as long as the civil law is not violated. There is no state religion here, and no requirement to practice a religion. Freedom of religion is one of the issues that led to the existence of the US in the first place.So, in a sense, it is not "the US" that has many religions; in terms of the civil law, enshrined in the Constitution, the US has no religion in particular. It is the citizens of the US who are free to practice whatever religion they choose.