What happens step by step for baptism if you're a Muslim?

Answer 1

Muslims do not practice baptism. Baptism is a Christian ritual that symbolically washes away the sin of Adam and Eve. Muslims believe that this sin was forgiven by God already, so you don't need to baptize a person. Here's a good link to an informative article on the subject.

Answer 2

It depends on how you read the question.

As Expert J.E.S. Hays notes, there is no requirement to submit to a baptism to join Islam or within Islam. The point of the baptism in Christianity is to have a physical symbol of the spiritual act of Jesus's forgiveness. As no such thing exists in Islam, the baptism is not necessary or useful.

As for a Muslim convert to Christianity who will undergo a baptism, this is no different than a baptism that the particular sect of Christianity would hold for a convert from any religion; being Muslim to start does not change the process. However, there are different processes depending on the sect or denomination of Christianity in question, some with partial immersion or sprinkling and some with full immersion.