i am reminded of the passage in Acts where the Spirit leads Phillip to the chariot of the Ethiopian eunuch. The Spirit moved Phillip to answer the sincere questions that the eunuch had. The result was a baptised convert. Notice that there was no "external signs" involved in the "conversion experience", the scriptures record simply that the eunuch went on his way rejoicing.
If there be a difficulty in the way that our churches and it's outreach ministries are presenting Christ, it is in the three general injunctions given to us in respect to scripture:
1) Add nothing to scripture;The scriptures do record conversion experiences, some rather dramatic. They do not tell us that these experiences will always be the way that God works on an individual.
2) Take nothing away from the scriptures;
3) Do not go beyond what is written;