Given the stakes involved, doesn't a deity have an obligation to clarify which sect has the correct dogma?

You'd think so, wouldn't you?

God is obligated to His creation because of the promises He made to it. He promised a renewal of Eden and of His creation that has been marred by Satan and by our own sinful actions. He chose a people to set an example of how to live righteously in His eyes. He showed us our sins by giving the Law and showed us how we can be redeemed by giving, as a sacrifice, the blood of His only Son, Jesus Christ. Now, it's our responsibility to live by Jesus' teachings and to tell those who don't know Jesus, the truth: The promise of redemption through Jesus Christ.

Typical...thinking the Creator God of all the Universe (yourself included) is actually obliged to you in some way. This is why pride is listed as the chief sin.

i wonder if it occurs to Christians just how much it takes to justify their absurd belief and how much they could accomplish if they put that much mental effort to other subjects.

I would agree but we both know that all gods are myths.

he has, do you really think the other sects would listen?