The Sadducees did not understand the Scriptural revelation about resurrection. Furthermore they did not realize that God"s power was sufficient to raise people and to raise them to a different type of life. Marriage as we know it will not exist when we have immortal bodies, and deathless existence will not require propagation of the human race. The Sadducees denied the existence of the angelic race ( Acts 23:8), which belief Jesus also corrected. They considered their views enlightened, but Jesus said they needed enlightening. Jesus did not say that when people die they become angels, which they do not, nor that we will be like angels in every respect, which we will not. [source][source][source]