I've often heard it said by people who are "spiritual" but not Biblical that "there is no wrong way to pray!"

I immediately think of a parable that Jesus told to some self-righteous people, who looked down on others:

Luke 18:10-14 NASB
“[10] Two men went up into the temple to pray, one a Pharisee and the other a tax collector. [11] The Pharisee stood and was praying this to himself: ‘God, I thank You that I am not like other people: swindlers, unjust, adulterers, or even like this tax collector. [12] I fast twice a week; I pay tithes of all that I get.’ [13] But the tax collector, standing some distance away, was even unwilling to lift up his eyes to heaven, but was beating his breast, saying, ‘God, be merciful to me, the sinner!’ [14] I tell you, this man went to his house justified rather than the other; for everyone who exalts himself will be humbled, but he who humbles himself will be exalted.”

It sounds to me like Jesus believed that there was a right way to pray and a wrong way to pray.

In fact, when Jesus' followers asked Him to teach them how to pray, the first thing He taught them was how NOT to pray:
- NOT like religious hypocrites who are motivated by public recognition and attention. (Mt. 6.5)
- NOT like pagan religions who use meaningless repetition in order to get their gods attention. (Mt. 6.7)

Just don't ever pray to get anyone's attention! You already have Jesus' attention and you don't need other peoples attention.

Jesus taught His followers to pray to an already attentive, Holy Father - that this Father's reign would come to earth - that this Father would provide and forgive - that He would deliver from temptation and evil. (Mt. 6.9-13)

Jesus teaching us to pray is really no different than a parent teaching their children how to address them properly. Sometimes I have to remind my kids to speak to adults reverently and to ask for things politely. I have to help them discover the line between intimacy (good) and familiarity (bad).

Understanding that there is a wrong way to pray should motivate us to want to learn how to pray, joining with Jesus' disciples who said; "Lord, teach us to pray!" (Lk. 11.1)