Also if a religious organization's survival and success have everything to do with God's approval, then how does the WT explain the success of the other groups of a similar age such as the LDS church, the 7th day Adventists
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Ironically, this list could include the IBSA, who were started by Russell and still thrive to this day. By WT dogma, that group should have disappeared years ago because they haven't "progressed" beyond Russell's teachings like WT claims to have done.
And, as you said BU2B, if surviving and thriving are clear signs of God's "approval", WT has certainly been bested by most religions in that department.