Does a state court's divided decision on the merits of a federal constitutional claim demonstrate that reasonable jurists would debate the claim's merits such that a certificate of appealability should issue?

Does a state court’s divided decision on the merits of a federal constitutional claim demonstrate that reasonable jurists would debate the claim’s merits such that a certificate of appealability should issue , as recognized by three Justices of this Court, the Seventh Circuit, the Fifth Circuit , and district courts in the Third Circuit , or may a federal court decline to issue a certificate of appealability in such circumstances, as done by the Third Circuit below, the Eighth Circuit, and district courts in the First, Third, and Eleventh Circuits?