If the question is not "what does Ephesians 5 alone prove?" but rather "what does Ephesians 5 say when read alongside the rest of Scripture?", then the relevant method is to identify the duties Paul attributes to Christ in the passage and ask whether Scripture elsewhere assigns analogous duties to human leaders, parents, husbands, elders, disciplers, or believers generally.
In Ephesians 5, Christ:
Loves the church.
Gives Himself for her.
Sanctifies her.
Cleanses her with the word.
Nourishes her.
Cherishes her.
Presents her glorious, holy, and blameless.
Exercises headship over her.
The question becomes: Are any of these functions uniquely divine, or does Scripture elsewhere call humans to participate in them?
Sanctification
Many assume sanctification is exclusively God's work.
Yet Scripture repeatedly commands believers to pursue it.
"Sanctify yourselves therefore, and be ye holy." (Leviticus 20:7)
"Cleanse yourselves from all filthiness of the flesh and spirit, perfecting holiness in the fear of God." (2 Corinthians 7:1)
"Pursue holiness." (Hebrews 12:14)
There is both:
God's sanctifying action.
Human participation in sanctification.
Presenting Others Mature
Paul uses language remarkably similar to Christ's purpose in Ephesians 5.
"Whom we preach, warning every man, and teaching every man in all wisdom; that we may present every man perfect in Christ Jesus." (Colossians 1:28)
Paul explicitly says his ministry aims to present others mature/perfect.
That sounds very close to:
"that he might present it to himself a glorious church" (Eph. 5:27)
Cleansing Through the Word
Ephesians 5:26:
"washing of water by the word."
Elsewhere leaders are commanded to teach, correct, rebuke, and train.
"All Scripture ... is profitable for doctrine, for reproof, for correction, for instruction in righteousness." (2 Timothy 3:16)
"Admonish one another." (Romans 15:14)
Believers participate in the Word's sanctifying ministry toward one another.
Building Others Up
Christ nourishes and cherishes the church.
Paul commands believers to do similarly.
"Edify one another." (1 Thessalonians 5:11)
"Let us consider one another to provoke unto love and good works." (Hebrews 10:24)
"Bear one another's burdens." (Galatians 6:2)
Parental Language
Scripture already gives fathers a formative role.
"Bring them up in the nurture and admonition of the Lord." (Ephesians 6:4)
The father is not creating spiritual life.
But he is responsible for formation, instruction, correction, and maturity.
Ministry Leadership
Paul speaks almost in parental terms:
"My little children, of whom I travail in birth again until Christ be formed in you." (Galatians 4:19)
Notice the language:
Christ formed in you.
Human labor toward that formation.
The divine and human roles are not treated as mutually exclusive.
The Key Distinction
The strongest objection usually rests on this premise:
Christ sanctifies the church.
Therefore husbands cannot have any analogous sanctifying role.
But Scripture often presents realities that are both divine works and human responsibilities.
Examples:
God teaches → parents teach.
God shepherds → elders shepherd.
God loves → husbands love.
God disciplines → fathers discipline.
God sanctifies → believers pursue holiness and help one another toward it.
Christ presents the church mature → Paul seeks to present believers mature.
The real question is not whether sanctification is uniquely God's work in an ultimate sense.
The real question is whether Ephesians 5 intends the husband's imitation of Christ to extend into the formative, nurturing, word-centered cultivation of his wife.
That is the exegetical question.
What can be said from the text itself is that Paul does not merely say:
"Christ loved, therefore husbands should love."
He expands the comparison through Christ's actions:
loved, gave Himself, sanctified, cleansed, nourished, cherished
presented glorious
and then says:
"Husbands, love your wives, just as Christ loved the church..."