My view on this topic is that it is already hard to find a compatible person, where mutual attraction exists, etc. and now we are also adding another criteria by seeking someone who is Christian (and there are various types/denominations with different views).
For me, while I think about or turn to God every day (for example, if I am going through something, or if someone is sick I ask God to make them well in a few sentences), I don't have a set prayer or devotional life where I spend 30 minutes in the morning or evening praying or reading the Bible everyday. So, personally I wouldn't want someone who never prays or doesn't want to talk about God, but at the same time if someone is spending a lot of time in prayer their lifestyle may also be different from mine and might not be too compatible. For example, would this person mind if I like to read fiction or will he think it is a waste of time, doesn't like going to the movies, etc. I am actually friends with people who are conservative this way, but being friends is one thing and being married to someone is different. So, in the Christian pool you have some who are not living Godly lives at all...all the way to those who are very conservative. Finding someone compatible within the Christian pool is important.