FFS... Yea, dude, they are...
An Atheist is characterized as a person who lacks, or outright refutes, belief in the existence of God or gods. On a scale from 1-10 of how much religion impacts their life and decisions they would be a 1.
A Muslim is characterized as a person who is, typically, extremely pious and closely adheres to the teachings and tenants of the Qur'an. This is demonstrated by the fact she is wearing a hijab, meaning her religion is important enough to openly display. On a scale from 1-10 of how much religion impacts their life and decisions they would be a 10.
In terms of lifestyle and beliefs, one of them walks a tightrope while the other stumbles around like a drunken toddler. They are very much opposites.
I assumed this was blatantly obvious to anyone with basic reasoning skills, but I was obviously wrong. More the fool, me.