'Baptized' in the Bible

Is Christ divided? Was it Paul who was crucified for you? Or were you baptized in Paul’s name?

I thank God that I baptized none of you except Crispus and Gaius,

so that no one can say you were baptized in my name.

I did, in fact, baptize the household of Stephanas; beyond that, I don’t know if I baptized anyone else.

and all were baptized into Moses in the cloud and in the sea.

For we were all baptized by one Spirit into one body—whether Jews or Greeks, whether slaves or free—and we were all made to drink of one Spirit.

Otherwise what will they do who are being baptized for the dead? If the dead are not raised at all, then why are people baptized for them?