Many questions about spiritual things are based in wrong presuppositions or false assumptions and can be set straight with an understanding of the scripture. Its easy to twist scripture to support whatever position you want. But Jesus' response will always be an accurate clarification of scripture and its application.
In Mark 12, the Sadducees attempted to trap Jesus by asking an absurd question based on a concept they didn't even believe in. Their goal wasn't understanding but entrapment. Jesus responded by clarifying the truth of scripture and its application.