It seems to me there is a distinction which needs to be made between turning from God and sinning.
We are all fallen creatures and will continue to fall. We go to confession, pick ourselves up, do penance, do charity, and try again.
Turning from God means apostacizing. I have been taught that if we are brought to Truth and then reject it, it would have been better if we had not known Truth, for apostacizing is a worse sin than having been ignorant.