While appearing to express the position of the article, this statement isn't true.
Any and every believer is to be a witness who ministers the gospel. No differentiation between male or female in this regards.
Women may also teach Scripture academically. No problem there.
Not every believer has the spiritual gift of Pastor-Teacher or of Evangelism. These are very real spiritual gifts, not soulish gifts. Every believer receives gifts upon receipt of salvation, but not all spiritual gifts include the communication spiritual gift of Pastor-Teacher, or of another communication spiritual gift of Evangelism.
Both which are recorded in Scripture as having been given to some men. No women are recorded as having these gifts.
In regards to the business having come or not come from believers is irrelevant. It might very well have come from believers. A believer out of fellowship with God by having sinned and not confessed that sin remains out of fellowship with God until he returns to God on God's terms. Some of the most antiChristian acts, behaviors, and beliefs come from believers not in fellowship with God. This is why some believers are known to have committed very heinous crimes, such as mass murder, or serial killing.
What does matter is that in God's Plan, He provides for teaching of believers by the the spiritual gift of Pastor-Teacher given to some men and He provides for the communication of the Gospel to unbelievers also by the spiritual gift of evangelism.
Most believers don;t know what their spiritual gifts are and unfortunately too many churches have mistaken the worldly leadership offices as simply being soulish positions void the spiritual action of God the Holy Spirit communicating to the Pastor how, when, what, why, and who to preach to in their messages.
A believer learning the Word should seek out the Pastor-Teacher God has provided for them. As soon as one sees a woman in the pulpit claiming the office of Pastor, it is obvious even in a soulish perspective that the person lacks the academic background to understand the gift, but instead is likely guided by some form of arrogance seeking worldly approbation for their desires, instead of walking by God's Plan.