I remember having a conversation with my parents about Abram and his son Isaac and how they traveled to the altar to perform the huge sacrifice of his son.  The idea behind it was that God was testing us to see how we would perform with our faith… Not because he wants to test us, but he knows that it will strengthen our faith in Him.  I was reading Deut today, and I found something similar:

 

13 If a prophet, or one who foretells by dreams, appears among you and announces to you a miraculous sign or wonder, 2 and if the sign or wonder of which he has spoken takes place, and he says, “Let us follow other gods” (gods you have not known) “and let us worship them,” 3 you must not listen to the words of that prophet or dreamer. The LORD your God is testing you to find out whether you love him with all your heart and with all your soul.
The Holy Bible : New International Version, electronic ed. (Grand Rapids: Zondervan, 1996). Dt 13:1–3.

It is very bluntly stated right there, that we will not worship other gods (yet another mention of worshiping other gods).  But if we hear someone say that– we should be weary, because God wants to see how well we will trust his word.