+Basil of Caesarea
And now for a little grammar lesson. Mind you, my tongue is just a bit in my cheek, but just the same...
Evangelism is an activity. "Evangelistic" is a word that describes a behavior. Evangelical is descriptive of theology, and not behavior: is the kind of thing that you either is, or you isn't. If you aren't on board with those four things, you isn't, and if you are, you is.
Bob is an evangelical.
Correct: Bob is very committed to evangelism.
Also Correct: Bob is very committed to evangelistic practices.
Permissible: Bob is very evangelistic. (the rest of the sentence, "… in his practices" would be implied, though it's very sloppy of you.)
Bob is very evangelical.
The same rules apply if one is speaking of a particular church or denomination.
Correct: First Baptist Church is very evangelistic. (That's good.)
Incorrect: First Baptist Church is very evangelical. (It sounds like you don't know what that word means.)
In addition! Please continue to read and contribute on the conversations below, and note that Michael Lee at Addison Road has offered some notions as to what a broadly evangelical stance on the Scriptures might look like, written with his usual wit: "Why I am (still) an Evangelical."