The Celestial Kingdom has three heavens or degrees within it. To attain the highest, which is the only one in which the marriage covenant exists and continues, a person must have entered into a marriage and been sealed by the holy spirit of promise. As D&C 131 explains:
This isn't easy. Wasn't meant to be. Do you really think any of us are worthy to be called "gods" without first descending below all things so as to be qualified to rise above all things? Christ is not merely our Savior, He is our example. We must "follow Him" if we want to be where He is.