In medical terms a phobia is an unhealthy or unrealistic fear. It is sometimes referred to as a mental illness. Webster calls it intense and irrational or exaggerated. It is true that not all fears are healthy, but fear of false religion is healthy. Islam has gone out of its way to say anyone rejecting Islam has a mental illness, which is dangerous and untrue. Islam brands all non islamists with the title. Fear of false religion, that can lead to losing one's soul in the judgment, is very healthy. This is equally true of homophobia, fear of gayness that can cost the soul is very healthy. Paul said to flee sexual immorality.
So, fleeing when real danger lurks is a Godly response. As when Joseph at God's warning took Mary and Jesus and fled to Egypt.
Matthew 2:13
And when they were departed, behold, the angel of the Lord appeareth to Joseph in a dream, saying, Arise, and take the young child and his mother, and flee into Egypt, and be thou there until I bring thee word: for Herod will seek the young child to destroy him.
Sometimes the danger to the spiritually weak is real, they should take heed. Even the strong can be in physical danger. The spiritually weak are in extreme danger with any false religion such as Islam. We would be crazy if we didn't fear for the people around us and our loved ones. Warning those in danger is a good response to any wolf in sheeps clothing. "Beware of those who come to you in sheeps clothing". We are commanded to beware.
Islam will never stay around to debate the strong who will destroy their credibility, but they will destroy the weak and young among us. Islam will murder the strong if they have opportunity. Or, they will brand us a mentally ill phobias. The danger is real.