He does this also in the visible Church. Satan is ever busy corrupting the Church and its doctrine. He gets the woman to mix the leaven in the childrens' meal, and the rotten stuff goes on putrefying, and all is fermented. For Christ, our Passover lamb, has been sacrificed. They perish because they refused to love the truth and so be saved.
Men can have truth or lies, which they prefer.
If they will to do God's will, He will give them truth and the Spirit will guide them ultimately into all the truth. If anyone chooses to do God's will, he will find out whether my teaching comes from God or whether I speak on my own. But when he, the Spirit of truth, comes, he will guide you into all truth. But if men will not have truth Satan will lead them step by step into all manner of delusion and falsehood. Satan has ministers and his church to carry on his work.