"Israelis who were vaccinated were 6.72 times more likely to get infected after the shot than after natural infection."
Still, it's far better to get vaccinated since most new cases are among the unvaccinated AND because even "break thru" infections lead to very mild if any symptoms.
Link: https://newsrescue.com/delta-variant-natural-immunity-700-greater-protection-than-shot-data-from-israeli-govt-shows/