Sarah wasn't cremated. Sarah was buried in the Cave at Macpelah at significant expense to Abraham. Abraham, Isaac, Jacob, Sarah, Rebecca, and Leah were all reported to have been buried there. Great effort was given to give honor post mortem and to provide a place for remembrance of the dead. Abraham and the Patriarchs valued burial and the Scripture provides a record of it.
Israel and Joseph were not cremated. Neither were they buried in Egypt where they had died. Instead, their bodies were transported to Israel at significant inconvenience and expense. The bones of Joseph were removed from Egypt during the Exodus and carried for forty years until their burial in the promised land. Great care was taken to give them a good burial.
At great risk, David recovered body parts from Saul and his sons after their bodies had been burned by the Philistines. Although he had been persecuted severely by Saul, David gave honor and a burial to the bones of Saul. (2 Samuel 21:14)
There is a burial that you don't want to miss:
For you were buried with Christ when you were baptized. And with him you were raised to new life because you trusted the mighty power of God, who raised Christ from the dead. (Colossians 2:12 NLT)
In India, Hindu practice promotes scattering of the ashes of the deceased in the Ganges River which makes the river less clean. Burial promotes public health.
Yes, many English martyrs were burned during the Reformation. Good point. This added to the indignity of how they were treated that their bodies were disposed in a disrespectful way.
Yes, cremation may save money. My personal view is that marked burial of the ashes in a box or urn is preferred over scattering. When last I knew, the RCC had changed their policies to allow cremation but did still forbid scattering. The closest approximation to that was burial of ashes in an urn at sea as was done for John Kennedy Jr.
Isaiah 53:9 has been viewed by many as prophecy of Jesus being buried in the rich man's tomb as was done.
If Jesus had been cremated, the story of the Resurrection would be different.