That is bollocks 101. There are arguments for the existance or non-existance of God. There are no arguments for the evenness or oddness of the blades of grass.
It is a simple example to make the point.
Why is this so hard.
Do you believe my lawn has an even number?
if not, can I then conclude that you think it has an odd number?
Do you understand the statement "I DO NOT BELIEVE X"
Does NOT "I BELIEVE X IS FALSE"
If you cannot understand that, then all logic will fail for you.