Put whatever spin on this very direct scripture that you'd like. I'm going to accept it as written: that saying "Lord" is not enough; DOING the will is also required.
"Doing" is a verb, mandating action for completion.
Romans 10:13 (English Standard Version)
13 For "everyone who calls on the name of the Lord will be saved."
How does your "very direct scripture" square with this "very direct scripture"?
Verses taken out of context (of the passage, of the chapter, of the book, and of the entire Bible) are not safe ground for doctrine. The entire NT's message is (paraphrased) "Believe in Jesus as Savior and Lord, and you will be saved". The words belief or faith are used right at 200 times in the NT. God put's no qualifier on Salvation.
Simply believe...
What did the thief on the cross “do” to merit salvation?