The Enemy's Attack

Talking about the Devil, or Satan, or Beelzebub, has become passé in many Christian contexts. For whatever reason, while they might hold onto the idea of an all-powerful and sovereign Lord over all, the idea of an angelic enemy that seeks the downfall of humanity is at best worn out, at worst humiliating. Yet, the Bible is relentless in seeing the Devil as our enemy, his attacks as real, and his power as standing behind evil. The OT is less emphatic in ways, but clear to the presence of a real enemy standing against the people of God. What do we do when he attacks? How will God respond?