The conservative author who accused Ellen DeGeneres of pushing a "gay agenda" on young people has now penned a letter to the talk show host, saying: "The true Christian Church must stand as a 'sign of contradiction' amidst ever-changing cultural trends".

Larry Tomczak originally wrote for the Christian Post warning of an "avalanche of gay programming assaulting" American homes.

"The indoctrination and propaganda coming from those advocating a gay lifestyle in our country, classrooms and culture are increasing. All of us need to take note and take action to guard those we love," he said.

"Are you really aware of this avalanche sweeping across our society today? It's not a trickle it's a Tsunami!"

As well as highlighting TV shows such as Glee, Grey's Anatomy and Modern Family as furthering this "gay agenda", Tomczak pointed particularly to DeGeneres.

She "celebrates her lesbianism and 'marriage' in between appearances of guests like Taylor Swift to attract young girls," he wrote.

DeGeneres then addressed Tomczak directly on her show, insisting that "My only agenda, Larry, the only way I'm trying to influence people, is to be more kind and compassionate with one another. That is the message I'm sending out. I don't have an agenda, I'm not here to brainwash anyone.

"I don't even know what it means to celebrate my lesbianism. I mean – well, I guess I do, it's like that!" she then joked, setting off a party popper.

DeGeneres also criticised the use of quotation marks in reference to her marriage to long-term partner Portia de Rossi, whom she wed in 2008.

Tomczak's latest contribution to the debate is an open letter to DeGeneres, in which he says he was "stunned and humbled" to be addressed by the TV personality. "I believe you are such an incredibly gifted comedian with a God-given gift to entertain and make people feel genuinely valued. You also have a megawatt smile that simply makes people feel happy," Tomczak writes.

"Contrary to what many may think having heard some quotes from my article, I approach you not as an angry, mean-spirited 'fundamentalist' but rather in a spirit of humility as a would-be friend. I'd love to chat with you one day over a cup of coffee."

The author admits that the Church has made mistakes in its approach to many issues, and "In the area of sexuality, we're all broken and have temptations and struggles to overcome". He calls for a more positive way of dealing with difference – "hasn't the time arrived...to lower our voices and approach one another with respect and civility?"

However, he also insists that gay marriage is a threat to modern society. "Ellen, a nation rises or falls on marriage," he writes.

"If we dismantle this pillar of society, as it has existed for over 5,000 years of Western civilization and redefine it to accommodate other arrangements such as yours (or those advocating for polyamorous, polygamous or other configurations) what will be the consequences for this sacred institution and the future of our nation?

"The true Christian Church must stand as a "sign of contradiction" amidst ever-changing cultural trends. With kindness and courage we must remain faithful to the truth, whether it is popular or not."