But Sir William M. Ramsay's assertion is based on historical evidence. For example let's look at some of Luke's writings.
From the article "I Don't Have Enough Faith to Be an Atheist"
by Frank Turek Chapter 10
Luke accurately records:
1. the natural crossing between correctly named ports (Acts 13:4-5)
2. the proper port (Perga) along the direct destination of a ship crossing from Cyprus (13:13)
3. the proper location of Lycaonia (14:6)
4. the unusual but correct declension of the name Lystra (14:6)
5. the correct language spoken in LystraCLycaonian (14:11)
6. two gods known to be so associatedCZeus and Hermes (14:12)
7. the proper port, Attalia, which returning travelers would use (14:25)
8. the correct order of approach to Derbe and then Lystra from the Cilician Gates (16:1; cf. 15:41)
9. the proper form of the name Troas (16:8)
10. the place of a conspicuous sailors' landmark, Samothrace (16:11)
11. the proper description of Philippi as a Roman colony (16:12)
12. the right location for the river (Gangites) near Philippi (16:13)
13. the proper association of Thyatira as a center of dyeing (16:14)
14. correct designations for the magistrates of the colony (16:22)
15. the proper locations (Amphipolis and Apollonia) where travelers would spend successive nights on this journey (17:1)
16. the presence of a synagogue in Thessalonica (17:1)
17. the proper term (Apolitarchs') used of the magistrates there (17:6)
18. the correct implication that sea travel is the most convenient way of reaching Athens, with the favoring east winds of summer sailing (17:14-15)
19. the abundant presence of images in Athens (17:16)
20. the reference to a synagogue in Athens (17:17)
There are 64 more such detailed facts written by Luke on this link, scroll down about a quarter of the way to see them.
http://www.theologyweb.com/campus/showthread.php?t=51643