Resurrection of dead ones: Act 26:8 Why is it judged unbelievable by you if God raises the dead?

Is there a resurrection? Mat 22:23-33 and Mar 12:18-26 and Luk_20:27-40 shows us clearly evident that there is a resurrection, and that we shall not be married after the resurrection, nor will we still be able to die. Also in 1Co 15:1-48 the question is, "Is it a resurrection of the dead?", and Paul concludes definitely that it is precisely that Act 4:1 And as they were speaking to the people, the priests, and the temple commander, and the Sadducees stood near them, Act 4:2 being distressed because they taught the people and announced in Jesus the resurrection from the dead.