Billy Graham is not the namesake of my faithIf Billy Graham (a notorious free-willer) endorsed TULIP, would you care? Neither do we care what Calvin says.
And BTW it was not just Calvin
So why is it even Calvin does not agree with you
But they commonly misintepret this text, and restrict the word ‘gift’ to faith alone. But Paul is only repeating his earlier statement in other words. He does not mean that faith is the gift of God, but that salvation is given to us by God … " (from, Calvin’s Commentaries 4:145
and the Calvinist Barnes
And that not of yourselves. That is, salvation does not proceed from yourselves. The word rendered that—τοῦτο—is in the neuter gender, and the word faith—πίστις—is in the feminine. The word “that,” therefore, does not refer particularly to faith, as being the gift of God, but to the salvation by grace of which he had been speaking. This is the interpretation of the passage which is the most obvious, and which is now generally conceded to be the true one; see Bloomfield1
1 Albert Barnes, Notes on the New Testament: Ephesians, Philippians & Colossians (ed. Robert Frew; London: Blackie & Son, 1884–1885), 42.
and this Calvinist
For by grace (τῃ γαρ χαριτι [tēi gar chariti]). Explanatory reason. “By the grace” already mentioned in verse 5 and so with the article. Through faith (δια πιστεως [dia pisteōs]). This phrase he adds in repeating what he said in verse 5 to make it plainer. “Grace” is God’s part, “faith” ours. And that (και τουτο [kai touto]). Neuter, not feminine ταυτη [tautē], and so refers not to πιστις [pistis] (feminine) or to χαρις [charis] (feminine also), but to the act of being saved by grace conditioned on faith on our part. Paul shows that salvation does not have its source (ἐξ ὑμων [ex humōn], out of you) in men, but from God. Besides, it is God’s gift (δωρον [dōron]) and not the result of our work.11 A.T. Robertson, Word Pictures in the New Testament (Nashville, TN: Broadman Press, 1933), Eph 2:8.
Finally
if faith is a gift from God, how could demonic activity restrict the faith of some (Luke 8:12; 2 Cor 4:4)? Why is it harder for some people to believe than others (cf. Titus 1:12-13)? What would be the point of the drawing work of the Holy Spirit (John 6:44; 12:32), or of evangelism and missions? Why was Jesus sometimes amazed at people’s lack of faith (Matt 8:26; 14:31; 16:8)? None of these questions have good answers if faith is a gift of God.
I notice you failed to deal with the rest including the questions based upon scriptural particulars