"What is tolerance... We are all full of weakness and errors; let us mutually pardon our follies. This is the last law of nature..."
Voltaire would not support the Pledge of Allegiance, because it contains the phrase "Under God". He believes the church and state should be separate. Because he believes it is not right to persecute someone, just because they have a different opinion than you. He stresses the point that we are the children of the same God, and it is wrong to oppress someone just because of different viewpoints.
"Yes of course; for are we not all children of the same father, and the creatures of the same god?"
Voltaire accepted Christian morality and he believed in God, but he disagreed that it was not right to discriminate someone, just because someone else has different beliefs than you. An example of this is in, "A Plea for Tolerance and Reason", where he explains equality.
"You know that intolerance produces only hypocrites or rebels, what distressing alternatives."
Voltaire influenced the Deceleration of Independence by teaching us to keep the church and state separate.