I am suspicious but not enough to reject roberts.
When it comes to this type of work, you do not HAVE to do something that objects your conscience. If he worked for a megafirm with hundreds of lawyers this does not mean much but do not underestimate the value of collaberation.
If this is an indication of how he would rule on homosexual marriage, then it is a dealbreaker. As a lawyer he should already KNOW that homosexuals already have access to cohabitation and estate planning. (even just making a deed "tenancy by the entireties" produces right now what homosexuals claim they don't have)