I am not sure of this. If you keep your conclusions based on facts...not influenced by personal feelings, interpretations, or prejudice...then it should not mislead other Muslims. As a scientist your goal is to discover the unknown, not to persuade Muslims into atheism.
Under these conditions, the knowledge of this particular atheist scientist, could still bring Muslims closer to Allah....and therefore be beneficial.
In fact...isn't all knowledge beneficial? of course there can be personal information sometimes which is better for you to not know...but I mean knowledge in general...can that be unbeneficial, and if yes, can you give one example of unbeneficial knowledge?
How I think about unbeneficial knowledge is this:
knowledge is like a weapon. in the hands of the goods, the weapon is good. in the hands of the wrong, the weapon is bad. But the weapon on its own is good nor bad.
the same with knowledge. The same knowledge who brings someone closer to Allah can cause some other away from Allah and therefore becom unbeneficial for this person.
like evolution...evolution appearantly was unbeneficial to Darwin...but to me personally it is beneficial knowledge because know I understand better how Allah created us Alhamdulillah.
Evolution aside, the topic about knowledge in general, whether good or bad is really mind boggling to me. I am a strong believer that gaining knowledge in general is good, and just like you said, it depends upon the person who learns it and how it affect him or how he uses it. But at the same time, we have things like black magic, where in islam, people are encouraged to not even to go close to it. It is even said that a person who goes to a sooth sayer for fun or laughs wont have his salat accepted for 40 days or something.
So it really is an unclear topic which feels like you cant really get a definitive answer. On one hand, logic and parts of the religion promotes all learning, and other parts such as things related to black magic tells us another ^o) ... opinions?