[annalex]

Should a conversion from Catholicism to Evangelical Christianity also be treated like a sincere journey of faith of an intelligent human being, not like an impressionable dolt who converts simply out of ignorance of his Catholic faith?

Yes, unless, of course, it is a case of an impressionable dolt converting (1) out of ignorance of the Catholic doctrine and reasons for them or (2) because Protestantism is not a very demanding faith.

[PetroniusMaximus]

“because Protestantism is not a very demanding faith.”

Like this...

“Come to me, all who labor and are heavy laden, and I will give you rest. Take my yoke upon you, and learn from me, for I am gentle and lowly in heart, and you will find rest for your souls. For my yoke is easy, and my burden is light.” - Matt 11

“For this is the love of God, that we keep his commandments. And his commandments are not burdensome.” - 1 John 5:3