Looking at context is not begging the question. Paul says nothing about vocational calling in the context. The whole context is about salvific calling. That's the thing. Your system is so rigid that you can't even see what the Bible is clearly saying.
Nothing about vocational calling. The whole context is about salvation, chapters ONE AND TWO. Look at verse 23-24. Paul is clearly taliking about calling to salvation, not calling to service. Paul contrasts Jews and Greeks and those that are called. He is not talking merely God determining to save both Greeks and Jews. Context reveals to us that he is talking about the types of people that are called. The Gospel is tailor made to draw people that are poor in spirit, humble, etc. (I wonder how they get to that state, HMMM...)It is repugnant to the proud, the rich in spirit, etc. God designed it this way. He designed the Gospel to be attractive to the meek and humble and repugnant to the strong and proud souls, that no flesh should boast.
Then in chapter two he clearly states that the preaching of the cross is foolishness to those who are perishing. And in chapter two, verse 4 He says that he did not come with eloquent words of man's wisdom, but in the demonstration of the Spirit and power. So much for your claim that the Spirit has nothing to do with the drawing of people to the Gospel.