The key to surviving the harsh environment was not to confuse faith with optimism.<br/><br/>Q) Can "confuse faith(A) with optimism(B)" be replaced with these?<br/><br/>1. "Mistake A as B"<br/>2. "Mix up A with B"<br/>3. "Take A for B"<br/><br/>Q2) If so, is #3 most colloquial?