Watch these interviews with Robert Schwartz about soul planningand Brian Weiss about past-life regression on Afterlife TV.
(Don't be put off by the awful cartoon intro!!)
*This is somewhat different to the strict Christian concept of having only one life on earth, and in that short(?) life needing to accept Jesus as the only way by which we can be accepted by God. Otherwise the consequences are too terrible to contemplate - either annihilation or even worse, eternal, yes ETERNAL punishment. What, from a God of love???
Now, if you were to ask the 'average' Christian who claims to be sincere in his/her faith, you're likely to find that they don't actually, actually believe that. Or at least, there's a get-out clause - well, God is merciful, or God alone knows what is in a person's heart or, at best, that God understands how hard it is to be human and will forgive you because he loves you.
** Sceptics would say not, because the latter is simply copying the former, but then some sceptics wouldn't believe an egg is an egg unless it were thrown in their faces! That may seem unkind, but after reading several sceptics' websites I can see that they are generally as biased against anything spiritual or unproven as other people are gullable. To be honest, I've given up listening to them and am content to make up my own mind, using my own logical, critical and experiential thinking. My usual thought process is not to accept anything straight away which does not fit into what I have learnt already. Even then I am cautious, aware that it is easy to accept something which does fit, even if it might not be true. I hold new or conflicting things in mind until I can either find additional evidence/material which substantiates them - even if it means questioning what I already have accepted - or until some other piece of information makes them less likely or undermines them.
Personally I doubt that Jane Roberts had read the Vale Owen books as (a) she wasn't interested in that sort of thing before Seth appeared and (b) the Vale Owen books are very British and not well known in America.