A major goal of scientific experiments and statistical methods is to approximate as best possible the counterfactual state of the world.  For example, one could run an experiment on identical twins who were known to consistently get the same grades on their tests. One twin is sent to study for six hours while the other is sent to the amusement park. If their test scores suddenly diverged by a large degree, this would be strong evidence that studying (or going to the amusement park) had a causal effect on test scores. In this case, correlation between studying and test scores would almost certainly imply causation.
The medical profession today is capable of many procedures that it was not in earlier times. This is a fact that makes the judgment of what we should do in various circumstances a far more complex issue than it used to be. Not all procedures are wise and some results clearly show that. Second opinions are often wise and advisable. God’s wisdom is clearly necessary to guide us through the maze of options. Obviously, if there is no medical help available and we are in an emergency health situation, we should pray for God’s help and get the medical help we need when available. For those who are reluctant to use doctors or they have not been able to help or even diagnose the problem, allow me to recommend an excellent alternative in a natural Christian health retreat that has helped people from all over the world called Living Valley Springs health retreat.
Finally, we pray to Thee, O Lord of mercy, to remember the souls of Thy servants departed who are gone before us with the sign of faith and repose in the sleep of peace; the souls of our parents, relatives, and friends; of those who, when living, were members of this congregation, and particularly of such as are lately deceased; of all benefactors who, by their donations or legacies to this Church, witnessed their zeal for the decency of divine worship and proved their claim to our grateful and charitable remembrance. To these, O Lord, and to all that rest in Christ, grant, we beseech Thee, a place of refreshment, light, and everlasting peace, through the same Jesus Christ, Our Lord and Savior. Amen.