Subject: What if there were only three forces created by the big bang?

In physics it is assumed that there were four forces created by the big bang:  
the electro-magnetic force, the strong atomic force, the weak atomic force, and 
gravity.  What if only the first three forces arose directly as a result of the 
big bang?  What if gravity were created after the big bang as a result of the 
interactions of two or all three of the primary forces?  Could this explain the 
problems that arise with coming up with unification theories for all four 
forces?

Re: What if there were only three forces created by the big bang?