Deut 4:24 - Relationship, not Religion
Don't ever let your Relationship to Jesus turn into Religion. Religion will send you straight to hell, but a Relationship will allow you to enter God's Kingdom in Heaven. Christianity as a whole is a religion, but it's based on the foundation of relationship. Without a relationship to Jesus there is no Christian religion.
Our relationship to Jesus is much like our relationship to our spouse - can you imagine the feeling of your spouse cheating on you? Even as I type this I get those feelings of jealousy come over me (I will rebuke them though! HA HA!). See, that's what separates religion from relationship - religion doesn't involve jealousy, as Deut 4:24 speaks about. When we give our hearts to Jesus He claims us as His own, so for us to "cheat" on Him and worship a false god would arouse His jealousy - why? Because we're in Relationship with Him and He loves us even more than we love our spouses! We are His bride!!!!!! Jealousy is a part of relationship, but not religion. God is jealous for us, so make sure you cultivate your relationship to Him or else He become jealous and have to deal with the "other" god you are worshipping!