1. "Were paying homage to pagan gods" is incorrect because the verb is in the past continuous form and the other verbs are in the simple past form. "...paid homage..." is correct.
2. This sentence is correct.
3. This sentence is correct.
4. "Most importantly medical supplies" is incorrect because it is a noun phrase and the other phrases are gerund phrases. "... supply medicines" or "providing medical supplies" is correct.
5. "The small bitter apples make the best cider" is incorrect because it is an independent clause and the other clauses are noun clauses. "...that the small bitter apples make the best cider" is correct.
6. This sentence is correct.