Actual Christian here. This decision is not extreme, whatsoever, though I get that it appears extreme to non-believers and feminists. The thing to understand here is that Christians follow the Bible. And conversely, those who do not follow the Bible are not Christian. So let's take a look at a relevant Bible passage:
Let the woman learn in silence with all subjection.
But I suffer not a woman to teach, nor to usurp authority over the man, but to be in silence.
(1 Timothy 2:11-12)
Now that's the word of God. It's eternal, unchanging, and dictates how He wills us to live.
It's definitely out-of-step with modern secular culture, and that's a very good thing from the Christian perspective. We are God's peculiar people (Titus 2:11-15).