Living Grounded: Seventh Day Adventists, First-Order Beliefs, Angel of the Lord & Inventions in Heav

Questions:

1. Who are the Seventh Day Adventists and what do they believe? Why do they keep the Sabbath on a Saturday?

2. I found your response to the gospel centred question helpful in understanding what you mean. Was just wondering if there are any other doctrines that you might see as first order besides doctrine regarding salvation? Thinking in terms of truth running along two train tracks and when you go off those tracks even slightly could lead to big problems into the future, possibly even affecting salvation doctrine. Are there any to be mindful of?

3. Who is the Angel of the Lord

4. Will humans continue to invent things in the new creation?