Only Christians have told me that the reason I am an atheist is because I didn’t pray hard enough/sincerely enough/in the proper manner.
The Bible says that other “false gods” exist…
I tend to take the Bible with a pillar of salt.
I see what you did there. 
Nope.
The thought hasn’t even crossed my head.
By calling them “false gods”, it is implicitly saying that these other gods are figments of mankind’s imagination, though.
Anyway. As a Christian, no, I have never prayed to another deity. I don’t believe they exist. Also, it’s explicitly against the First Commandment. (I’m not saying I haven’t broken some of the commandments before: By my count, I’ve broken the Third, Fourth, Fifth, Eighth, Ninth and Tenth at some point. But I’m tryin’.)
I dunno who you talked to, but their understanding of faith and grace was seriously flawed. As is yours, apparently.
In what way, pray tell?
Becoming a Christian, or “finding God” has nothing to do with how “hard you pray” or anything else you do. The heart of Christianity is that you can not do anything in and of yourself to reach Him, or be worthy. It is His Grace and Mercy at work. Praying isn’t something you can do right or wrong. It’s not magical, you aren’t mouthing some incantation. It is communicating with God. Talking, or thinking with Him. There are no formulas, or beads, or specified clothing, or anything else weird.
Would you be willing to try that approach with other gods?
“You worship the Nine Divines, perhaps? Have they ever helped or harmed you? Of course not. Now, worship a Daedra Lord, and you get effects… bad ones, of course, but clear and measurable effects.”
– Ulene Hlervu, The Elder Scrolls IV: Oblivion
Why would I? Again, you are having a disconnect. My relationship with Jesus is much like that of a spouse. My relationship is with Him. Not others.
By definition, any other gods (and I use that term because you do, not because I believe them to be) are of a lesser status.
Mind you, I am not trying to convince you of the truth of the claims, I am just trying to express the worldview for you. I won’t try to convert you, I would appreciate you not trying to convert me, or ridicule my faith.
There are two big differences. One is, if they’re correct, that would be a difference. The other I cover below.
Evidently you’re not familiar with the parts of the Bible and Christian faith that say that if you open yourself to God, He’ll connect with you. Sorry, I can’t quote chapter and verse, but many can, and many do.
But since you’re not of that ilk, I don’t think this is directed at you.
Seriously, though, there is a simple answer to the OP. If you open up yourself to the One True God and He [… someone feel free to fill in the blanks here, this part confuses me …] after which you’re a Believer, there’s no reason to look around. There’s no inherent contradiction in what these Christians are saying. Sorry, but there’s no “gotcha” here.
There’s just the blatant falsehood, as some of us know from experience: it doesn’t necessarily work.
Religion is a socially heritable trait, along with language. Most people adopt that of their parents. Far more heritable than intelligence, work ethic, optimism, and any number of personal psychological traits. It’s clear that for most people, cultural bias matters much more than anything else.
How is he in the sack ?
If you wanted a serious discussion, I would oblige. Since you are clearly only an asshole, I won’t waste my time.
How about if I ask?
Oh dear, I am soooo not touching that one. 
This ain’t the Pit, girlfriend. You can’t insult people here.
Friendly reminder. And no reporting, since I ain’t an asshole*. I’m just tickled in the funny bone by nonsense, is all.
- this is not intended as a factual statement
If I might extend the analogy, and honestly meaning no offense to you; if I had only ever been in a relationship with the one person, and had no alternative experiences to compare with, how could I judge that relationship? I mean (and again, I really don’t mean to offend, but this is the best way I can think of to put it within this analogy), there are people out there in abusive relationships with their spouse, who are convinced that it’s possible for someone to both love them and deliberately hurt them as a consequence of that love. Obviously this isn’t all relationships, and there are many magnificient ones out there. But without comparison, how can we really know whether ours is a true and loving one?
And perhaps it’s an obvious point, but; *your *relationship may be only with him. His is, at least optimistically, with everyone.
It is just one-sided though or does he actually talk back, and if so how does he communicate back to you? Is it verbally, or throughout your day do you pick up on things, thinking God is trying to tell you something?