I think Sauron deliberately used Tengwar to mock the Elves. The Black Speech is absolutely nothing like Quenya and Sindarin. Sauron wanted to mock the Elves' beautiful language(s) and thus, used Tengwar to write those horrible words on the Ring.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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