I think "being in the world but not of the world" has more to do with how we treat people not issues of personal purity which most seem to focus more on today than actual relationships. Love does no harm to a neighbor. If the entertainment I intake doesn't harm my neighbor then there probably isn't a problem with it.
Christians are very afraid of sin because they think & live as if it
is more powerful than Christ in them. It is not in the slightest.
Satan's only attack is trying to get you to believe lies. Christians are
in far more danger of Satan's attacks from the falsehoods spread at
most pulpits than they are with secular entertainment. A lie about God
is the most dangerous kind of lie & can make you miserable your
entire life. Performance based religion that says Jesus didn't take care
of our sin problem is the most worldly thing of all.
When we think we "step away from God" by our actions He is always right
there. You can't "step away from God." Nothing you can do separates you
from His love. Trust in that truth and your worries about "being taken
away from Christ," "stepping away from God," "breaking fellowship with
God" will fall off and you will get to bask in His true love that never
lets you go. If you fall He goes down with you to help you back up.
Our faith is what overcomes the world (1 John 5:4). "Our faith" isn't
our morality. Faith means you trust in God, in His love and goodness
towards you. That faith is weakened or nullified when you believe His
love and goodness have barriers. Christ removed all barriers at the
cross. Fear not for He is with you.