Bunyip
pro scapegoat
Yes. It is possible to mishandle and abuse the concept of religion, often out of desire to overrate the significance of belief in God.
Religion is just a word, it can not be abused. Words have meanings and usages that change over time. Also for the majority of religious people the belief in god is foundational to their concept of religion.
To use a word as it is commonly understood, is not abuse.
Sure, religion is not exclusive to those who believe in a god, but that does not mean that people who do take religion to mean a belief in a higher power are wrong to use the word religion to mean a belief in a higher power - it is abroadly accepted and common usage.
Many words have several meanings, all of which are correct in different contexts. It would be false to suggest that somebody using one meaning is abusing the word or concept simply because there are other meanings in other contexts.