I cannot see how your example of Christ sitting with sinners or His saving work has anything to do with reading a deeply heretical book which has led many souls astray, endorsing it as a good read, and then supporting it by going to see it in the theaters. Are we to accept such actions as Christlike 'engagement with sinners'? Is this the way Christ led by example? He did not shun the sinner, as you mention, but He did shun the sin.