I am assuming that you are trying to say that medicine is not perfect, and thereby I am also assuming that you are NOT saying that a doctor :
who has to first
excel in his premedical courses.
then do well in medical college admissions test.
go through a rigorous application process where thousands apply and only a few hundred get in.
Study constantly for about 2 years and work constantly in rotations for the next two years,
Kill the boards, match into a residency.
Learn to live off $35,000 for 3-4 years and pay medical school loans ($200,000 loans) on this salary.
Is on-call and ready to work even in the weekends (work 80 hrs per week).
Again , I am assuming that you are NOT saying that he (the doctor) is wasting his time with the patients because modern medical science fails to cure some rare cases.
With that said, ofcourse modern medicine is not perfect, it is evolving and more effective than these so called alternative medical options such as "Homeopathy" or "Ayurveda" in many-if not all- cases.
Your statement that modern medical science cures only symptoms and "Thats it", is a gross understatement.
End of discussion.