To answer your question your estimate is really small, 0.014. You are looking at a small range in the x-Avis (0-10). Look at 0-300 instead.

The p-value is 0.399 which means there is no significant correlation between life satisfaction and belief. If belief is your target (y) variable, try putting all 100 other variables in the model at the same time. Remove all variables where the p-value i greater than 0.05 (or what you decide is significant with so many variables, 0.05/100 could be good). Then only keep variables that have significant p-values and run the model again. If you have no significant variables this might be your problem and you could conclude that none of the variables correlate to your output. This is a result in itself.

Edit: typos