So far no one has said why some "scholars" doubt that Paul wrote Ephesians. Does anyone know the rationale they are using?
Here are the basic arguments. Keep in mind this is only a basic summary of very technical arguments. But all in all, here are the conclusions.
1. The theology is said to be too advanced. While there are some clear Pauline themes (Eph. 2.8-9), but the dominate issues in the letter are only weakly attested in the other Pauline letters (which they contest).
2. Of course, they always through in words and phrases not used in other acknowledged Pauline letters. (This has always seemed like a silly argument to me, but they insist that this is a factor. I suppose in some places, it could be a little strange not to find common terminology, such as the end of Mark, but it is beyond me why they suppose authors cannot have different vocabulary, especially in letters that emphasize issues and themes that are not emphasized in other letters)
3. The style of the letter is an issue, as this is not Paul's normal style. The sheer length of sentences is especially something to be noticed. The letter is not Paul's normal direct style of written communication. Even acknowledging that this is not Paul's normal style is not necessarily a problem, because the theme of this letter is different than themes found in Paul's other letters.
4. The other major argument is to compare Ephesians to Colossians. This is a major argument but I am not that familiar with it. Any good Evangelical NT Introduction will have a good summary of it. I'll check it out in some of my resources later if no one else is familiar with it.
Hope this helps.
Randy