A member of the right-wing UK Independence Party claims gay adoption is 'child abuse'.
The party's culture spokesman, Winston McKenzie, called for a ban on gay and lesbian people adopting.
The Christian spoke to The Metro ahead of the Croydon North by-election on Thursday (29 November) in which the former boxer is running to become a Member of Parliament.
During the interview, he said: 'To say to a child, "I am having you adopted by two men who kiss regularly but don't worry about it" - that is abuse.
'It is a violation of a child's human rights because that child has no opportunity to grow up under normal circumstances.'
He also told local media that he believed LGBT parents might raise the child to be gay.
'Would you seriously want that or a heterosexual family? Which would be more healthy for the child?
'A caring loving home is a heterosexual or single family. I don't believe [a gay couple] is healthy for a child.'
His homophobic tirade comes amid controversy over Rotherham Council's decision to remove three young children from their foster parents because the couple were UKIP members.
The party's candidate in the northern English town's recent by-election won votes on the back of public outrage about the story.
Action for Children, a charity which supports adoption and fostering services in the UK, claims gay parents can and do make good parents.
Jane Butler, service development manager for Action for Children, said: 'Social workers tell us that LGBT adopters have significant strengths when it comes to adoption, particularly the energy and enthusiasm that they show as well their openness to difference.
'Over the years, our LGBT foster carers and adopters have helped to transform many children's lives and we welcome more applications from LGBT people.'
UK-based gay rights group Stonewall slammed McKenzie, with the charity's chief executive Ben Summerskill saying: ‘These 19th-century views are not acceptable in the 21st century.’
UKIP were unavailable for a comment, but their openly gay London chairman David Coburn insisted his party supported equal rights for LGBT people.