I personally think that; not only are seminaries not necessary, but are in most cases dangerous to a persons spiritual health.
After a person has been brought to accept Jesus as their Lord and savior, by the Christians preachers, teachers, pastors, and have been given the Holy Spirit it is no longer necessary to be taught by man, right?
Did Paul go to a seminary? Did man teach Paul? Doesnt every Christian have the same Holy Spirit given to them as Paul had given to him?
(John 10:16) And there are other sheep I have that are not of this fold, and these I have to lead as well. They too will listen to my voice, and there will be only one flock, and one shepherd. (John 10:27) The sheep that belong to me listen to my voice; I know them and they follow me.
(John 16:13) But when the Spirit of truth comes he will lead you to the complete truth, since he will not be speaking as from himself but will say only what he has learnt; and he will tell you of the things to come.
(1 Corinthians 1:19-21) As scripture says: I shall destroy the wisdom of the wise and bring to nothing all the learning of the learned. Where are the philosophers now? Where are the scribes? Where are any of our thinkers today? Do you see now how God has shown up the foolishness of human wisdom? If it was Gods wisdom that human wisdom should not know God, it was because God wanted to save those who have faith through the foolishness of the message that we preach.
(1 Corinthians 2:10-16) These are the very things that God has revealed to us through the Spirit, for the Spirit reaches the depts. Of everything, even the depths of God. After all, the depths of a man can only be known by his own spirit, not by any other man, and in the same way the depths of God can only be known by the Spirit of God. Now instead of the spirit of the world, we have received the Spirit that comes from God, to teach us to understand the gifts that he has given us. Therefore we teach, not in the way in which philosophy is taught, but in the way that the Spirit teaches us: we teach spiritual things spiritually. A spiritual man, on the other hand, is able to judge the value of everything and his own value in not to be judged by other men. As scripture says; Who can know the mind of the Lord, so who can teach him? But we are those who have the mind of Christ.