The salvation of all the people in the whole world is only in Heaven because it is the dwelling place of God where His Holy Throne, His Eternal Kingdom is set up.
Practically, seeking the Kingdom of God is leading to heaven. We are mandated by Christ to seek first the Kingdom of God not the religious denominations or anything. For it is written:
“But seek ye first the Kingdom of God, and his righteousness; and all these things shall be added unto you.” (Matthew 6:33)
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