The influence of the Catholic church is no doubt far reaching but I doubt that atheists contributed much if at all to Christian scholarship.
Considering you haven't read any, that's quite a claim.
Most atheists take a critical view of religion which is why they're atheists and agnostic means nothing anymore considering the broad usage of the term.
The entire historical Jesus project is a "critical view" of Jesus. From start to finish it is at best neutral to christianity and far more often critical of christian dogma. Historians START with the assumption that miracles, gods, etc, are outside of the realm of historical inquiry. As such, a history of Jesus' mission cannot confirm his miracles or his divinity, but it CAN make, and has made for centuries, critical claims about many beliefs held by mainstream christianity.
I'm not making an argument from silence, I'm simply stating that you're still sore about not being able to use Acts to support your notions about James.
You are not simply stating that. You have used the fact that Acts never mentions James as being specifically the brother of the lord as evidence against the idea that Jesus had a brother named James. That IS an argument from silence.
Acts can't be used to confirm anything least of all James since there's absolutely no way of confirming who this James was that's referred to after Acts12:2.
First, we don't need acts to confirm that Jesus had a brother named James. We have three other independent sources.
Second, Acts can be used to confirm many things. The author of acts was around during the events described in Acts.