This is categorically wrong. French spelling has absolutely nowhere near as many idiosyncrasies as English spelling.

It is totally impossible to predict how an unfamiliar written word is pronounced in English, but quite easy in French (barring some ambiguous situations like if a noun ends in “s”.)

By the way, I don’t know what CA means. If you’re referring to the French word “ça”, its pronunciation is completely regular and predictable given the spelling.