The fact is, you aren't going to convert a single person by offending them needlessly.
Then how do you needfully offend them? People of other religions are going to be offended by the gospel. No one likes being told they are dead wrong, but that is a huge part of The Way (biblically used; not Weirwille's cult). And in particular, when it comes down to the 'binary deistic system' (my own term)-- where the number of gods believed in is either 1 or 0-- we are dealing with greater certainty of what is already believed (or staunchly disbelieved), and it is harder to persuade an atheist or a muslim that they are wrong than, say, those of Paul's world who believed in, but did not fear, the Olympic gods.