  A Bayesian statistical analysis using redshift space distortions data is
performed to test a model of Symmetric Teleparallel Gravity where gravity is
non-metrical. The cosmological background mimics a $\Lambda$CDM evolution but
differences arise in the perturbations. The linear matter fluctuations are
numerically evolved and the study of the growth rate of structures is analysed
in this cosmological setting. The best fit parameters reveal that the
$\sigma_8$ tension between Planck and Large Scale Structure data can be
alleviated within this framework.
