the first manmade doctrine that comes to mind, because of this thread, is the one where people say that which is perfect is the Bible so no more tongues
they forget that also includes prophecies (although many still to be fulfilled) and knowledge....some do behave as though they have no knowledge but most would agree that knowledge is still around
Well, I never met people which teaches, that speaking in tongues is given as 1.Cor. 12-14 says.
But people who teach that speaking in tongues is combined with the baptism of the Holy Spirit.
I believe that every bornagain believer is baptised with the Holy Spirit and he got a spirituell gift, as 1. Cor. and Romans 12 teaches according the will of the Holy Spirit.
In different to the church of Corinth, we have the complete scripture and we dont need that the Holy Spirit reveals us his will through a prophecie in the church. ( This means not that God is not speaking today through his word and the Holy Spirit uses this word in the situation of an believer)
We also dont need sign and miracles in the church to believe the power of God. But in spreading the gospel to gentiles (mission) God works today still and is doing miracles and wonders.
But I cant find that speaking in tongues is the sign that someone is baptised with the Holy Spirit taught anywhere in the bible to other believers.
And you are right there are many man made doctrines in the church today.