If you define faith as "belief without evidence" then it is totally incompatible with reason. Why? because according to reason, beliefs are only justified if they are based on evidence , https://twitter.com/McAllisterDen/status/1252959366589931521
If by faith, you mean a belief in something without good evidence that it is true (or even contrary to evidence that it is not true), yes, that is by definition not a reasonable position to take. Reason involves looking at the evidence and drawing conclusions based upon it.