In an ultimate sense the answer is no. Why did God ordain circumcision for the Israelites? We can speculate but we will never find an ultimate answer. If God wanted penis' to function better or differently why did He not make them so initially?
The scriptures indicate there is symbolism attached to circumcision, we should remove the flesh physically which directs us to the spiritual putting off of the flesh (aka sinful nature). From a biological health point of view I don't think circumcision provides substantial benefit over the "stock" penis.
Therefore IMO even God himself views his directive for circumcision as arbitrary. How the Israelites respond to God's directives speaks to the quality of relationship.
If the Israelites (or Christians) try and come up with descriptive claims after the fact of why circumcision is better than not I think that
misses the point completely.
Even if it were proved that circumcision causes more infections and is worse for overall health the Israelites would still have an obligation to circumcise if they want to honor God as their authority.
Connecting this back to gender roles...
Even if it were proved (which it may be I dunno) that women are better leaders/decision makers etc. that doesn't change what God has ordained. Therefore Christians that seek to submit to God will attempt to obey his directives regarding gender roles.
Quote:
Does it need to be explained?
to summarize the above... God said it, therefore if we acknowledge God's authority we should attempt to adhere to those directives.
If we don't care about God's authority then we can do whatever we see fit and that will also reflect what our attitude is toward God.
As is so often the case the real question is a question of intention not action.