Since the definition of time is the measurement of intervals between events in a continuum, therefore before the Big Bang, before there were any events, there were no intervals between events, therefore, there was no time. Only God existed (exists). Therefore, God exists outside of time. (Except when God the Son entered into time to become a human being.)
No it isn't.
therefore before the Big Bang, before there were any events,
What makes you think there weren't any events before the Big Bang? Be specific.
there were no intervals between events, therefore, there was no time.
Your premises are flawed, therefore your conclusion is fallacious.
Only God existed (exists).
Please demonstrate that nothing existed before the Big Bang. Show your work. Then you can win the Nobel prize. We'll wait. You also forgot to demonstrate the validity of your "God existed" premise.
Therefore, God exists outside of time. (Except when God the Son entered into time to become a human being.)
Again, fallacious conclusion based on faulty premises.