'Baptism' in the Bible

Is there a division in Christ? was Paul nailed to the cross for you? or were you given baptism in the name of Paul?

I give praise to God that not one of you had baptism from me, but Crispus and Gaius;

So that no one may be able to say that you had baptism in my name.

And I gave baptism to the house of Stephanas; but I am not certain that any others had baptism from me.

For Christ sent me, not to give baptism, but to be a preacher of the good news: not with wise words, for fear that the cross of Christ might be made of no value.

And they all had baptism from Moses in the cloud and in the sea;

For through the baptism of the one Spirit we were all formed into one body, Jews or Greeks, servants or free men, and were all made full of the same Spirit.

Again, what will they do who are given baptism for the dead? if the dead do not come back at all, why are people given baptism for them?