This unfortunately is a dreadful misconception.
Antibiotics are very important in medicine but they do have limitations.
Antibiotics are very useful in treating bacterial illnesses such as strep throat, ear infections, bronchitis, sinusitis, pneumonia, bladder infections, to name a few. They also are important in the prevention of bacterial infections, so we give them prophylactically to people with heart murmurs, before dental procedures, or before certain surgical procedures to prevent or hinder the growth of bacteria. Antibiotics are not risk free drugs. They do have some unpleasant side effects such as nausea, vomiting, abdominal pain, hives, diarrhea, constipation, dizziness. Most of these side effects are self limiting and not life threatening, but occasionally there have been drug reactions that have been fatal.