Actually both of them were also active in the anti-slavery movement, that is how they met eachother. But regardless, are you saying whatever lack of enlightenment they had regarding racial issues was related to their lack of religious faith? I don't see the connection.
Do you deny that their leadership helped gain the right to vote for ALL women, which you as a black woman DO benefit from? (well, perhaps the "benefits" of this right are questionable but you know what i mean.)
If your theory is that a movement or "revolution" cannot be effectively led by one who lacks "spirituality", their example would seem to disprove that. They set out to gain suffrage for all women, and they succeeded at that.
Besides, can you name any leader whose vision was not flawed in one way or another? Sexism was epidemic throughout civil rights movement, from the SCLC to the Panthers. During Ghandi's time in South Africa he expressed no interest whatsoever in seeking justice for the Black majority living under apartheid, taking note only of how it affected the Indians living there. Religious faith did not help any of these leaders expand their vision.