The academic public policy take on this is as follows:
Diversity of opinion can be in several forms:
* a diversity of available (biased) channels, even though some of them give no time to opposing opinions
* a diversity of programs over time within a channel
* a diversity of opinions within a program.
For a FTA channel using the radio spectrum, the broadcasting license gives the right to use a scarce public good (one of the very limited number of interference free VHF or UHF channels available in the service area) giving access (and ability to influence) all citizens. In that case it is reasonable for the channel to be required to reflect the diversity of political, religious, and scientific opinion within the country.
There are so many channels available on cable and satellite that there is no requirement for any one of them to be required to reflect diversity of opinion.
There is no requirement to reflect diversity in any particular program - with the possible exception of programs that are produced with public money.
IMHO science does not have to reflect religious views because they are not about science.
similarly, religion does not have to have a scientific basis because it is not about science.
The two belief sets do not overlap. R union S = 0 , T=True , R= False
On an earlier point, TV networks are usually not paid to present a program. If they do, it is because they believe that it will be of sufficient interest to enable advertisements to be sold to a target audience through it. The networks are not in the least interested in the truth contained therein. They are not in the business of relaying truth. For God's sake! - they are in the advertising industry.