Is there a contradiction between the Hadiths stating that everyone with an atom's weight of faith in their heart will be brought out of the Fire, and the verses mentioning that disbelievers "believe only a little"? And does this little belief save them from the Fire?

The exegetes differed regarding the meaning of the verse: "So little is what they believe" (Surat An-Nisa, 4:46). Some said: Few of them believe. Others said: Their faith is little and does not benefit them because it is overwhelmed by their disbelief in what Muhammad (peace be upon him) brought. Still others said: They do not believe in anything at all, and the verse is in the style of the Arabs when they say, "Seldom have I seen his like," meaning, "I have never seen him at all." Based on this, the verse does not attest to them having little faith, nor does it imply their exit from the Fire, and there is no contradiction between it and the hadiths.