Why did a moral god kill Nadad & Abihu?

[Drich]

In Leviticus 10 God smites Nadad & Abihu for using "common fire" instead of "Holy Fire" in their offering. Now in modern days we know that fire is not a "thing" it is simply a chemical reaction and it's source is the chemicals involved and nothing more, yet two men were killed for this? (1) Why?

Because God said do A and they did B. Doing B when God said do A is a death sentence no matter how trivial to someone else.

Secondly, the men's bodies were not to be touched and the men not mourned by commandment of god. (2) Why would a loving god forbid the mourning as an expression of love.

Not true. Read the account again:4 Then Moses called Mishael and Elzaphan, the sons of Uzziel the uncle of Aaron, and said to them, “Come near, carry your brethren from before the sanctuary out of the camp.” 5 So they went near and carried them by their tunics out of the camp, as Moses had said.

I thought god loved everyone,

Noope you thought wrong. God does not love everyone
http://atheistforums.org/thread-12703.html

and jesus was quite the love man, but here the men are to be hated for making a mistake in the method they worshiped god.

Good point! So what you are saying is without Jesus' attoning sacerfice we would be held to the letter of God's Expressed will? I absolutely agree!

Why has god not punished all the hundreds of various judeo christian doctrines and religions that exist today?

It's like you said above. For the same attonement that covers our sin when we are willfully outside of the expressed will of God also covers us when we make mistakes in our most heart felt worship.
http://atheistforums.org/thread-12406.html

(3) Why would he kill his worshipers for using the "wrong" fire, yet let Joe Smith of the mormons peer through rocks to divine his message?

Because those two in lev 10 established the high standards God demands for worship without the attoning Grace offered by the blood of Christ. Smitty took avantage of the same grace offered by Christ to those who try and worship Him with all of their being. Christ told us that He would allow the wheat (believers) and Weeds (people who may look like wheat but are not) to grow along side each other, until the final judgement.

It is after this judgement that men like that will experience the 'holy fire' these two men did in lev 10.

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Is it ok for us to morn the cruelly murdered by god today? What's the verdict theists?

Begs the question