Michael Lohan's devout Christian faith will prevent him from walking his actress daughter Lindsay Lohan down the aisle if she chooses to marry Samantha Ronson.

Lohan and DJ Ronson have long refused to confirm rumours they are in a romantic relationship, but reports suggest the couple is now planning to exchange vows in a commitment ceremony.

However, Michael, a born-again Christian, is convinced the Mean Girls star won't invite him to be a part of the event.

He tells MSNBC's The Scoop, "I haven't heard anything (about an upcoming wedding) from Lindsay, but if she was marrying Sam, I don't think she'd ask me to walk her down the aisle."

"She knows about my (Christian) faith. She just wouldn't ask."

But Michael insists he isn't against his daughter settling down with Ronson - as long as Lindsay is happy.

He adds, "I want her to be happy and healthy and stay on the right path. If I discuss (her relationship), I say that I want her to be happy."

Legislation to ban gay marriage in California was overturned in May.