this is a difficult decision/choie!
it is hard not to separate people you consider friends from their actions...but, that is what is expected of us...your spiritual health, your faith, your morals, your actions are compromised by the people you keep company with...you choose Christ or you choose those who are not Christ like...also remember the definition of friend...be true to yourself,your beliefs and you will have a circle of friends that you would gladly introduce to Christ...if you are ashamed of those you stay with and would not want to say ’here Lord are those I spend time with’...then you have answered your own question...be strong, my prayers are with you...