I believe we are in great danger today as Christians. We need to make sure we do not become lukewarm. The world has ways of causing this to happen.
In Deuteronomy 6:4-9 we are told to love God with all our heart, soul and might.
In Leviticus 19:26 it tells us plainly not to have anything to do with witchcraft. This includes fortune-telling and reading the horoscope. Be careful what you watch and what your children watch. Harry Potter is witchcraft and evil. Also haloween, it's not fun, it's dangerous and I don't mean tooth decay from the sweets at trick or treat.
We need to know God's word in our hearts. Satan will try and convince us things are not really harmful (saying God will protect us, Matthew 4:6,7) Satan tempted Jesus by saying he would give Jesus the kingdoms of the world, Matthew 4:8,9. Often we are tempted by the kingdoms of this world, the riches, sex, and glamour. But we need to look to God and worship Him alone.
Don't be afraid be strong and stand up for Jesus and His righteousness! Also do not allow yourself to become morally loose but stand out from the world in purity and love.
Revelation 3:20,21 says To him who overcomes I will grant to sit with Me on My throne as I also overcame and sat down with My Father on His throne.