I know quite a bit about Origen - and don’t see how Christianity was helped by his theology (though he did do some good comparative works comparing manuscripts). But anyone who denied a literal resurrection of Christ is not a reliable theologian or interpreter of scripture in my book.
I don’t know near as much about GReogry of Nazianzen (and admit I got him and Gregory of Nyassa confused in Church History I). What I do know - he stood against Arianism - the relationship of the Trinity, are God the Father, God the Son, and God the Holy Spirit actually three distinct entities, or are these just simple essences or manifestations? A rather deep subject. Gregory basically argued for three distinct Persons of the Trinity.
But I really don’t see how the average Christian would be affected negatively in any way by not knowing a single detail about either man. Knowledge of men is inconsequential to salvation (other than the saving faith in Christ Jesus alone).
ignorance is not one of the virtues