well honestly this again is a topic that answers are easy to find if one looks online
and sine the OP diodn't state what TYPE of LION< that makes it impossible to really answer here
BUT in the general answer is YES< you can HUNT Lions with a BOW
and YES it can BE done safely and efficiently, if the shooter follows the basic's to make clean kills on dangerous game animals!
folks kill much larger and just as dangerous animals with BOW
S all the time, problem free! and HAVE done so since archery tackle has been about!
can there be BAD outcomes, YUP sure can, but that can happen with rifles too if were being honest!