That is quite a charge.
I'm betting that you cannot support that at all. Most people don't actually care if your preferred deity exists or not.
You may want to visit some prominent wittings on Secularism here is a snippet of one:
Religion has always been a force to reckon with in the scheme of things from time immemorial.
The cultures of societies, organizations and individuals have been in the most part, influenced by
it. In other words, religion took the center stage in informing, explaining, authenticating and
legitimating human actions in the society. It was apparent as a centripetal force from where the
society drew its strength, sense of meaning and direction.
However, with the emergence of science and empiricism, rationalization, industrialization,
urbanization, and indeed modernity, there appeared to be a change in societal worldview as
religion purportedly started to lose its all-round grip on the society. In the words of Taylor
(2007:560) as cited in Ritzer and Stepnisky (2014), the “death of God” appeared inevitable. This
process is said to be a direct consequence of modernization. A lot of phenomena that were
explained religiously were given more empirical and rational explanations. This situation gave
birth to what is generally known as secularization. In a sense, secularization has to do with the
views that religion has declined, lost its influence on the society and as a matter of fact, would
gradually fizzle out. The latter is the prediction of most of the founding fathers of sociology of
religion which include August Comte, Max Weber and Emile Durkheim.
As an introductory endeavour, this chapter will attempt to give a concise meaning of
secularization, discuss the varying views of the proponents of the secularization theory, x-ray the
processes of secularization and finally discuss some arguments against it".
The Secularization Thesis