Because Wallace's idea was a mirror image to Charles Darwin's theory of natural selection, I can safely say that the bullet point "In order for traits to evolve and change, they MUST be heritable" easily gave Darwin and Wallace a negative effect to their theory. Unless they where able to explain this point, it allowed many scientist like Jean-Baptiste Lamark to to argue Wallace and Darwin's theory was incorrect or lacked more explanation
Although, I believe Wallace was positively influential to Darwin's theory of evolution, I can safely say that Darwin would have still developed his theory of evolution without him. Mainly because Charles had his theory well backed up before Wallace sent over his findings. Wallace findings of natural selection only pressure Darwin to reveal his findings sooner then later.
The attitude of the church was not in favored toward the publication of Darwin's book "On the Origin of Species". The church felt as if Darwin was ruling out to even consider religion and god as part of any contribution to evolution. Darwin in fact was more concerned with his fellow
http://anthro.palomar.edu/evolve/evolve_2.htm
http://anthro.palomar.edu/evolve/evolve_2.htm