Do you just mean that 1) you shared the gospel with them and 2) they believed it? In any case, you did not cause them to believe it; you did not convert them--you did not cause them to be converted.
You make it sound as though you think you caused them to believe.
Without exception, sharing the truth about Jesus Christ with others is being kind and loving.
Why, if
you caused them to believe (and it was "not that hard" to do so)?
Which goes to show that
you (the evangelist) do not cause the ones who do to believe. For, if you did, and it's "not that hard", why did they not all believe?