What is corruption? Here is what the dictionary says:
• Putrefaction, the decomposition of recently-living matter. Other meanings of the term use this as a metaphor.
• Political corruption, the dysfunction of a political system or institution in which government officials, political officials or employees seek illegitimate personal gain through actions such as bribery, extortion, cronyism, nepotism, patronage, graft, and embezzlement.
o Political corruption is a specific form of rent seeking (not to be confused with property rental), where access to politics is restricted by limited transparency, limited competition and domination of narrow interests.
• Corporate corruption, the abuse of power by corporate managers against shareholders or consumers.
• Data corruption, an unintended change to data in storage or in transit.
• Linguistic corruption, the change in meaning to a language or a text introduced by cumulative errors in transcription as changes in the language speakers' comprehension.
And what is religion? Here:
Religion . . . means the conscious relation between man and God, and the expression of that relation in human conduct. --J. K["o]stlin (Schaff-Herzog Encyc.)
Knowing from the foregoing what is corruption and what is religion, now we go to the question: Is religion the root of corruption?
Nature teaches us that if the root is guava, then surely the trunk is also guava. Now, God as known by those who believe in Him, is Holy and incorruptible. And this Holy One calls the believers to be holy just He is holy. All their actions and non-actions should be aimed at holiness and incorruption, for that is what the God that they believe in wants of them.
Clearly, if religion is a root, and a holy and incorruptible root, therefore it's trunk could be no other but holy and incorruptible too. Hence, the answer to the question is a big NO. Religion therefore, true religion that is, could never be a root of corruption.