I suspect I am liberal in some ways and conservative in others. However, one valuable test for oneself is whether the road you are on is narrow or not.
“Enter through the narrow gate. For wide is the gate and broad is the road that leads to destruction, and many enter through it. But small is the gate and narrow the road that leads to life, and only a few find it. (Matthew 7:13-14, 1984 NIV) This passage is about people who call themselves Christians, not those not even trying to enter through the gate.
Another one is to examine in what ways your actions (which are a good indication of your heart condition) reflect that Jesus is your Lord—the One who has a right to tell you how to live and what is right and what is wrong. If Jesus is not your Lord, he is
the Savior, but not
your Savior. If a Christian is living as he or she pleases without regard to Jesus' commands because they are forgiven ("free"), then Jesus is not their Lord.
In light of how hard remaining faithful to Christ can be, it is helpful to occasionally ponder the fact that you (and we) never earned God's salvation. You never deserved God's grace or salvation. And now that you have it, you can never, ever pay back what you were given. Genuine thankfulness is a sign of faith in the Lord.
Personally, I used to get called "liberal" by conservatives and "conservative" by liberals. I finally figured out why. I have conservative beliefs for the way I live my own life, but I am an advocate for those who want to live the way they want to live. After all, if God gives me free will, he extends that to everyone else as well, and who am I to trump God and tell people they have to live by my conservative values. I also believe in some really liberal life concepts like harm reduction rather than abstinence for addiction recovery, legal abortion (as a matter of harm reduction), etc. It's all part of the free will parcel, as far as I am concerned.
It can be a fine line sometimes. We are to be thankful for our ability to choose, but not for people living as they want. Our lives should reflect that Jesus IS Lord of all in every way, not just in our own behavior. We are to be examples of Jesus to people. Jesus never indicated or implied that it was up to someone to obey God or not. His message was more along the lines of, "choose to entrust yourself to God or perish."
Otherwise we are hypocrites, people for whom Jesus had harsh words. We are not to be promoters of free will, as in "free to do anything." We are to be promoters of the idea we have the freedom to to yield to Jesus' Lordship (which brings reward), and the alternative is eternal punishment.
In those days Israel had no king; everyone did as he saw fit. (Judges 17:6 and Judges 21:25, 1984 NIV) These verses were condemnations.