It's absurd to suggest that society can function absent a moral foundation based in a righteous religion in the face of a century of data that directly contradicts this assertion. A couple generations into a secular society we no longer know what a man and woman is, we're castrating our children, our children are being murdered within their schools, babies are murdered in the womb by the million per year. Secularism has been a catastrophic disaster. You cannot point to any secular society that has been successful long term. At best they've been overtaken by a strong religious society and at worst it has been a murderous disaster.
I've not said that, but it is true. Fortunately, as a Christian I have the truth on my side and violence is not necessary to assure victory. All I need is an open market place of ideas where my ideas can exist safely. When that no longer exists, when my family is not safe because our religion our hand is forced. Let me be very clear that I don't want violence, I don't seek it, but I will not allow my family to go quietly into the night.
Name just one successful and secular society? Most of the Scandinavian countries, most of western Europe, nearly the entirety of Japan, most of Australia and New Zealand, etc. Not only that, but these countries rank higher in almost every societal metric. I am guessing you haven't travelled to these places... I have. The people are largely happy, healthy, they take care of one another with far less crime than we have here in the USA. There are churches here, but very few. The people in these countries tend to have higher levels of education, which is a threat to organized religion as it makes it very difficult to control an educated, independent person. It is also hard to push antiquated, bronze-age techings that the earth is flat and only 6,000 years old, that man walked with dinosaurs, that God condones the ownership of slaves, that women are second-class citizens who can be beat, etc, to a population of educated people who can think critically.
The fact is, those who have been indoctrinated and radicalized by religion are not accepting of an "open market" of ideas as you proclaim. The fact you mention that you are white and want to "defend" that is telling by itself of what your true motives really area. I think it is incredibly sad how the teachings of Jesus have been distorted to weaponize a white nationalistic ideology while dehumanizing anyone who doesn't think the same, believe the same, walk and talk the same. By dehumanizing them, it is easier to strip them of their freedoms, constitutional protections, their families, their liberty and even their lives. All of this is anti-Christian.
There was a growing number of MAGA who hated Charlie Kirk, like the fringe lunatic Larua Loomer, and the shooter was clearly one of the same. I think certain people I won't mention really wanted the shooter to be someone the "righteous right" could collectively hate and rally against. Someone with silly pronouns with blue hair, a pentagram tattoo and a nose ring. Someone they could dehumanize to fit the "they did this" narrative to make it easier to divide the country in a manufactured "us vs them" war that the left and the right media is propagating.