Churchill move on to 37 points from 19 matches. Dempo, meanwhile, remain ninth with 22 points from 19 matches.
Spain's Javier Siverio produced the solitary goal as East Bengal beat Punjab FC 1-0 in the final Group A game to qualify for the knockout stages of the Durand Cup in Kolkata on Wednesday.
With their fourth win of the campaign, ATK have now 14 points from seven matches while NorthEast, who have 10 points, are at fourth spot.
Here is a round-up of results from the ISL and I-League matches played on Tuesday
RoundGlass Punjab FC scripted history on Saturday as they clinched the I-League title with a game to spare.
The foreign contingent was forced to stay back after the I-League season had been stopped abruptly due to the outbreak of the pandemic.
All the results from the I-League and ISL matches played on Saturday
East Bengal suffered their third defeat in a row to be on eight points from seven matches.