I would be patient. Generally people do these separately. So, you will have to wait until you receive a response.

It is difficult to respond without knowing what was in the letter.

If you have close relative US Citizen you may have a path. Otherwise you may need to find an employer or school to sponsor you.

It is possible you could be denied entry but highly unlikely, given that you are a naturalized citizen. Unless there are potential crimes they...

If he has committed criminal activity, you may want to call the police.

You can make changes and explain the situation at the interview stage.

There is a visa for a religious worker, it is not clear whether you qualify or not.

You may want to write them a letter and/or contact your Congressman or Senator.

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The travel ban is currently preventing her from getting the green card.

Don't despair. His criminal record will not likely have an impact unless it is related to certain crimes. If you overstay a valid visa but marry...