and that life is completely devoid of any purpose or meaning

That is an unjustified jump to to an incorrect conclusion about agnostic belief. Life need not be devoid of anything but religion for a non believer or agnostic. We still try to make the most of life with family and friends and try to do good by others. The natural world exists outside of religious belief and nature is a beautiful thing. It need not be worshipped but admired and respected. All life is nature. Most agnostics are not nihilists but see all people and animals and plants as equals.

Let common sense prevail over secularism.