The majority of newbies, in my opinion, are unable to see the significance and effect of Bitcoin's potential and the need to have trust in its sustained rise. As a Bitcoin investor or evangelist, I must first state that you must acknowledge and embrace its ideals before making an investment. I suppose the first thing an investor should think about is that. You also mentioned that it's crucial for investors to have a strong faith in Bitcoin, believing in its future growth and realising that it's preferable to choose long-term growth over short-term gain when it comes to Bitcoin investment.
your faith in bitcoin is more like the prerequisite thing that gets you started in bitcoin investment, once you have started, you should not be talking about not having too much faith in bitcoin or not, what you should be talking about is how you can effectively remain invested for the long run and set parameters in place that will help you get the best from your investment...
You can start investing in bitcoin with little faith and still succeed. I don't us to attach too much religion to financial investment because that can bring some form or careless behavior with the belief that their faith will correct such actions. What is needed to succeed in bitcoin is not all about faith but following the right approach which is investing with only discretionary income, setting up emergency funds and ensuring you plan long term. Even if you are new to bitcoin and do not have much faith in it but you follow this step, you will succeed as a bitcoin investor. Key point is, don't over complicate the process.