Everyone is biased in some way. That's not necessarily a sin. For example, rooting for one team over another is a form of bias. There's nothing sinful in that, of course. But having one set of rules for one team at the expense of another isn't bias, it's cheating. That's the issue with the so-called mainstream media. They have openly advocated for Joe Biden by suppressing credible evidence of his corruption. That's not mere bias, it's corruption.
The truth should be important to Christians and regardless of our views on President Trump, we shouldn't accept the fact that the media is plainly assisting his opponent in the upcoming election. All major news agencies recently ran stories about allegations that President Trump had said disparaging things about soldiers despite the report citing only "anonymous" sources. Despite this extremely low journalistic standard, they refuse to report on the horrible scandal of Hunter Biden's shady business dealings in Ukraine and China despite the evidence being Hunter's personal emails! That's corruption. For this reason, we need to face the fact that the media isn't merely biased and are, therefore, no longer journalists.