The correct answer to this open question is the following.
You did not provide any specific reference or context. So we understand we can answer in general terms.
The possible consequences of internal differences for religions would be the following.
Religion is an institution created by man. It has nothing divine.
Religious teachings are a completely different thing. But religion, as an institution of society, is a creation of humans to gain and exert power and control over people as it has been proved since the conception of religion on planet Eart and it is better shown with the actions of the church during the Middle Ages.
In those years, the church killed in the name of God through the inquisition. Very dark years.
So this context serves to the specific answer to this question. The consequences of internal differences for religions would be the internal division of the religion and the creation of schisms, like the one that happened with Protestantism and Martin Luther in medieval times. These differences often are the result of political and economic differences between powerful clergy groups that try to control the church as a social institution. Most religions manage a lot of money and private property, and as they are administered by humans, these political differences are the ones that end up being the reasons for internal fractures.
