Scifi novel published around 80s or 90s, part of a series.
Interplanetary space opera with a young adult slant/approach.
Earth colony, but Earth is not featured or mentioned.
Main story centered around solar system with two suns, one main sun where all the "core" planets are located and where the main seat of government/alliance is based, and a smaller sun orbiting the main sun with smaller planets orbiting the smaller sun.
Main conflict comes from the other planets rebelling/declaring civil war/declaring independence from the main planet/government.
The protagonists are young (teens maybe); they are on vacation when war breaks out, protagonists know how to fly spaceships/planes but have to travel on foot to the planet's capital to escape & return to their father who is a captain/admiral/important government or space fleet/navy officer.
Technology is highly discouraged or destroyed on the protagonists' planet during the revolt.
Transportation mechanism is like a door appears out of thin air and on the opposite of the transporter door is a spaceship/warship.
Ending part of the novel entails
the protagonists sneaking into the mayor's (presidential?) home in the capital city, the last place with technology/electricity and has anti-orbital bombardment shields turned on as the capital city is being attacked/bombarded by rebel forces. The protagonists are able to turn on an emergency beacon/send a message to their father and they are rescued via transporter.
There are elements of religious/religion influences:
books are being burned on the protagonists' planet, but before they leave via the transporter door, one of the protagonists buries his/her Bible(?) or other important book near the presidential/mayor's house or yard that becomes main driver of the 2nd book in the series.
It's driving me crazy that I know all of these details but can't Google/search for this book.