God is often more patient with us than we are with ourselves. We assume that if we fall, we aren’t born again. If we stumble, then we aren’t truly converted. If we have the old desires, then we must not be a new creation.
If you are anxious about this, please remember, “God began doing a good work in you, and I am sure he will continue it until it is finished when Jesus Christ comes again” (Phil. 1:6).