You should look at the global measures of the model to determine if the model is significant. Not test of the slope. Usually these involve chi square test of some type. The Hosmer-Lemeshow test of model fit is also commonly used to assess model value.

Side note is that the intercept does mean something, but not likely what you are looking for. if X1 and X2 were binary variables, the intercept could be used to calculate the predicted probability of the outcome when both X1 and X2 were set to their reference value. So regardless of your predictors the predicted probability of the outcome in your sample.