But despite his best efforts, he was unable to convince House of Commons Speaker Andrew Scheer that the "cyberbullying" and "crowd-shaming" that he claimed to have experienced after questioning the science behind evolution constituted a breach of his parliamentary privilege.
Several colleagues on both the government and opposition sides of the House supported his question of privilege.
The Speaker allowed Lunney just over 10 minutes to deliver a a wide-ranging speech on religious freedom, the history of chiropractic therapy and the "false construct" of evolution, but Scheer eventually shut down the newly independent MP on procedural grounds after Lunney failed to garner the necessary unanimous consent to continue.
On Wednesday, Lunney revealed he had decided to leave the Conservative caucus in order to defend his religious beliefs against what he described as "deliberate attempts to suppress a Christian world-view from professional and economic opportunity in law, medicine, and academia."
In a written statement, he pointed to the "firestorm of criticism and condemnation" triggered by media coverage after he came to the defence of an Ontario Tory MPP who caused an uproar at Queen's Park when he told reporters he doesn't believe in evolution.
"My remarks were inflated by media, blended with other unrelated but alleged heretical statements and became a top story on national media," the chiropractor-turned-MP noted.
"Since two other politicians in Ontario and Alberta were targeted during the same period, it is clear that any politician or candidate of faith is going to be subjected to the same public scrutiny in coming elections."
He went on to say that it was this "ignorance and bigotry cloaked in defence of science" that led him to "voluntarily" withdraw from caucus to sit as an independent.
"I will seek an opportunity to address the House in defence of my beliefs and the concerns of my faith community," he pledged.
"Given the circling trolls, I do not intend to entangle the most multi-racial, multicultural and multi-faith caucus in parliamentary history in my decision to defend my beliefs."
Christian group lauds 'move for freedom'
Lunney's decision to leave caucus was heralded by MY Canada, a faith-based advocacy group.
In an email headlined "Christian MP makes move for freedom," the group called on the Canadian Christian community to support his "principled decision."
"Please keep Dr. Lunney, his family and staff in prayer at this important time where they will undoubtedly receive some persecution for their stance," the email advised.
It also suggests that supporters send email to not only Lunney, but also Prime Minister Stephen Harper, "to let him know that you fully support Dr. Lunney's decision and that you hope that he will work to ensure Canada remains a nation where Christians' rights are protected in the same way other religions' and people groups' are."
Lunney, who was first elected as a Canadian Alliance member in 2000, had previously announced that he did not intend to seek re-election in 2015.
Until then, he says he will "continue to vote alongside my colleagues in the Conservative caucus."
Asked for comment on Tuesday by CBC News, Harper's office offered a terse reply.
"This member voluntarily removed himself from caucus," Stephen Lecce told CBC News in an email.
"This member was not seeking re-election."Suggest a correction