Does Luke chapter 16 verses 9 through 13 warn us that there is no middle ground between serving God and serving mammon? Luke 16:9 through 13  KJV

9  And I say unto you, Make to yourselves friends of the mammon of unrighteousness; that, when ye fail, they may receive you into everlasting habitations.
10  He that is faithful in that which is least is faithful also in much: and he that is unjust in the least is unjust also in much.
11  If therefore ye have not been faithful in the unrighteous mammon, who will commit to your trust the true riches?
12  And if ye have not been faithful in that which is another man's, who shall give you that which is your own?
13  No servant can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. Ye cannot serve God and mammon.
Yes, there is no middle ground. The language here is that of worship; the idea is that mammon is an alternative god to God. The stress here from Jesus, and throughout the New Testament (1 Timothy 6:3-10 comes to mind), is that mammon, or money, is to be used to serve the Trinity, rather than to be served as god itself. 

This is the antithesis to what has been called the prosperity gospel, where the Trinity is used to serve mammon instead of the other way around.